No 12673, Tuesday 09 Jul 2019, Incognito

ACROSS
8   Shogun/Samurai's concealed weapons (4) GUNS [T]
9    These decisions, conveyed by Sherlock Holmes to Dr. Watson at lunchtime might have sounded like his usual observation (10) ALIMENTARY (~ elementary)
10 Put money into Indian undershirt (6) INVEST {IN}{VEST}
11 Miranda cooked with energy and made a liquid for soaking food (8) MARINADE {MIRANDA*}{E}
12 British flying champ permitted to get a bangle (8) BRACELET {BR}{ACE}{LET}
14 Illogical like a sailor with an irrational root (6) ABSURD {AB}{SURD}
16 Tail-less skuas morph into other birds (4) AUKS SKUAs*

17 Cyril Fotheringay-Phipps manages my bar (5) BARMY*
18 Englishman in Australia has a bit of pageantry and grandeur (4) POMP {POM}{Pa...y}
19 Loved present day mineral having diamond (6) ADORED {AD}{ORE}{D}
21 Participants appear after ward speaks wildly (8) ENTRANTS {ENT}{RANTS}
23 Murders a criminal for percussion organs (8) EARDRUMS*
26 Strip? Where one takes off? (6) RUNWAY [CD]
27 ... and won back after male engineers were present at this place and time (4,3,3) HERE AND NOW {AND}{WON<=} after {HE}{RE}
28 Container fire (4) SACK [DD]

DOWN
1    Task completion time makes a change in fortunes (10) TURNAROUND [DD]
2    Securities and Exchange Commission returns filed after German town makes extracts (8) ESSENCES {ESSEN}{SEC<=}
3    Business group has some mode of transport on English channel at last (6) CARTEL {CART}{E}{c...eL}
4    Is returned by American in old Asian nation (4) SIAM {IS<=}{AM}
5    One is not sure how many days this month has (8) FEBRUARY [CD]
6    Rises up, paradoxically, in places to sit (6) STANDS [DD]
7    Dry part of Faridabad (4) ARID [T]
13 You in olden times included arithmetic. For example, the number of feet one may find in the yard (5) THREE {TH{R}EE}
15 Canter around MIT on receipt of Euro money transfer (10) REMITTANCE {RE{MIT}TANC*}{E}
17 Yes, French game partners on cot are a sort of migrant people (8) BEDOIUNS {BED}{OUI}{N S}
18 Simplest legal document contains directions (8) PLAINEST {PLAIN{E}{S}T}
20 Communists standing back to back become more embarrassed (6) REDDER {RED<>DER}
22 Frowns endlessly after the player left match that was purposely forfeited (6) THROWN {THe}{fROWNs}
24 Implements found in Cartesian co-ordinate systems (4) AXES [DD]
25 Without Latin ratio, for example (4) SINE Anno pending [DD] See comments

Reference List
Energy = E, British = BR, Sailor = AB, Engineers = RE(Royal Engineers), Engliah = E, American = AM, Arithmetic = R, Euro = E, Partners N, S, Directions = E,S,  Player = E

GRID