ACROSS
1 "Commander's fit to capture stronghold — At ease!" (11) COMFORTABLE {COM}{FORT}{ABLE}
9 Rule Niger badly (5) REIGN*
10 I am on time, you hear! Without any preparation! (9) IMPROMPTU {I'M}{PROMPT}{U(~you)}
11 Abreast, like LR? (4,2,4) SIDE BY SIDE Definition by example
12 It's chokey for one just over 18 shortly (4) BRIG [DD] (Abvn of Brigadier)
13 Spoilt, stale unit (5) TESLA*
15 Indy team danced for Wodehouse's uncle? (8) DYNAMITE*
17 Ban bird's tap (8) STOPCOCK {STOP}{COCK}
19 Dramatist: "First, nothing less than 10 to the power of 100" (5) GOGOL GoOGOL
22 Din, in India, may follow this type of pain? (4) ACHE [DD]
23 Foreign country expels national leader resulting in estrangement (10) ALIENATION {ALIEN}{nATION}
26 Perhaps, trunk-callers erroneously telephone, substituting a nine, at first, for one six in the beginning (9) ELEPHANTS{TELEPH(-o+a+nine}ANE}*{Six} (Addendum - {TELEPH(-one+an)AN}*{Six} - See comments)
27 Goodbye, heads of all departments in English university (5) ADIEU Acrostic
28 Gardner lies about chief troublemakers (11) RINGLEADERS*
DOWN
1 Behind church, daughter consumes one large tot (5) CHILD {CH}{1}{L}{D}
2 Con man on the run consumes BLT preparation in the peak of European tourism (4,5) MONT BLANC {CON+MAN}* over {BLT}*
3 It's built with two rings and ellipse to start with serving no practical purpose (6) OTIOSE {O+O+ITS}*{El...e}
4 Unenthusiastically dresses pet lazily (7) TEPIDLY {PET*}{IDLY}
5 Bishop loves king? Novel, perhaps (4) BOOK {B}{OO}{K}
6 Sending out old wine and gin cocktail (9) EXPORTING {EX}{PORT}{GIN*}
7 Test paper, set without presence of PTA, is determined in advance (6) PRESET {TESt+paPER}*
8 Swiss psychiatrist is at the French forest (6) JUNGLE {JUNG}{LE}
14 Track deer footprints with some hesitation, followed by swallow, an insectivorous creature (5,4) SLOTH BEARS{LOTH} {BEAR} Anno pending (Addendum - {SLOT}{He...n} BEAR} - See comments)
16 Increase, in Agra, government value added tax on energy (9) AGGRAVATE {AG{G}RA}{VAT}{E}
17 Reptiles slither? Ask Sen (6) SNAKES*
18 Foreign currency is with the Spanish officer (7) COLONEL {COLON}{EL}
20 Indian monkey found in Jalan Gurdwara (6) LANGUR [T]
21 Somehow aspire for Iran of yore (6) PERSIA*
24 Plants four Romans, that is, senators initially (5) IVIES {IV}{IE}{Se...s}
25 Mongolian ruler takes thousand ethnic Chinese (4) KHAN {K}{HAN}
GRID
1 "Commander's fit to capture stronghold — At ease!" (11) COMFORTABLE {COM}{FORT}{ABLE}
9 Rule Niger badly (5) REIGN*
10 I am on time, you hear! Without any preparation! (9) IMPROMPTU {I'M}{PROMPT}{U(~you)}
11 Abreast, like LR? (4,2,4) SIDE BY SIDE Definition by example
12 It's chokey for one just over 18 shortly (4) BRIG [DD] (Abvn of Brigadier)
13 Spoilt, stale unit (5) TESLA*
15 Indy team danced for Wodehouse's uncle? (8) DYNAMITE*
17 Ban bird's tap (8) STOPCOCK {STOP}{COCK}
19 Dramatist: "First, nothing less than 10 to the power of 100" (5) GOGOL G
22 Din, in India, may follow this type of pain? (4) ACHE [DD]
23 Foreign country expels national leader resulting in estrangement (10) ALIENATION {ALIEN}{
26 Perhaps, trunk-callers erroneously telephone, substituting a nine, at first, for one six in the beginning (9) ELEPHANTS
27 Goodbye, heads of all departments in English university (5) ADIEU Acrostic
28 Gardner lies about chief troublemakers (11) RINGLEADERS*
DOWN
1 Behind church, daughter consumes one large tot (5) CHILD {CH}{1}{L}{D}
2 Con man on the run consumes BLT preparation in the peak of European tourism (4,5) MONT BLANC {CON+MAN}* over {BLT}*
3 It's built with two rings and ellipse to start with serving no practical purpose (6) OTIOSE {O+O+ITS}*{E
4 Unenthusiastically dresses pet lazily (7) TEPIDLY {PET*}{IDLY}
5 Bishop loves king? Novel, perhaps (4) BOOK {B}{OO}{K}
6 Sending out old wine and gin cocktail (9) EXPORTING {EX}{PORT}{GIN*}
7 Test paper, set without presence of PTA, is determined in advance (6) PRESET {TES
8 Swiss psychiatrist is at the French forest (6) JUNGLE {JUNG}{LE}
14 Track deer footprints with some hesitation, followed by swallow, an insectivorous creature (5,4) SLOTH BEAR
16 Increase, in Agra, government value added tax on energy (9) AGGRAVATE {AG{G}RA}{VAT}{E}
17 Reptiles slither? Ask Sen (6) SNAKES*
18 Foreign currency is with the Spanish officer (7) COLONEL {COLON}{EL}
20 Indian monkey found in Jalan Gurdwara (6) LANGUR [T]
21 Somehow aspire for Iran of yore (6) PERSIA*
24 Plants four Romans, that is, senators initially (5) IVIES {IV}{IE}{S
25 Mongolian ruler takes thousand ethnic Chinese (4) KHAN {K}{HAN}
GRID