1 - Retreat river is peculiarly black (4,4) - {FAL}{L BACK*}
5 - Except behind a neighbour (4) - {A}{BUT}
9 - Sicken to see a aunt in distress (8) - NAUSEATE*
10 - Sellout to this girl at this place (6) - {HIT}{HER}
12 - Tunnel effect for one out of a hole (4) - ECHO ?
13 - Gun sound for a youngster she demonstrates in an Asian country (10) - {BANG}{LAD}{ESH*}
15 - Skill based battlefield tactics (14) - COUNTERATTACKS [CD] What kind of skill is this ?
17 - Plant fragment in the land even led to confusion (6,8) - FRENCH LAVENDER Anno pending
21 - Brick put up in fort (10) - {BLOCK}{HOUSE}
22 - Sicilian peak in Vietnam (4) - ETNA [T]
25 - Snatch the young goat in daybreak (6) - {KID}{NAP}
26 - A beer den is erected in the North sea port (8) - ABERDEEN*
27 - Soldiers half keep the toothy tool (4) - {RA}{KE
28 - Initially revive an infected deer around the Buddhist monastery having a cattle disease (3,5) - {R}{ED {WAT}ER*}
DOWN
1 - Pass the tube (6) - FUNNEL [DD]
2 - Giggle at the French with a cry of disgust (5) - {LA}{UGH} Giggle!!
3 - Soundly wiped out the salad ingredient (4) - BEET(~beat)
4 - Type of cheese in the lodge (7) - COTTAGE [DD]
6 - Cracked bearing around the tin vessel (10) - {BRIGAN{TIN}E*}
7 - The other university will measure each review left of a language (9) - {TEH*}{U}{EL}{CHE
8 - Out into view in a tower in front of the house (5) - PORCH [CD]
11 - Taj Mahal city is in the diagram (4) - AGRA [T]
14 - Bit of this and that (5,5) - KNICK KNACK [CD]
16 - Somehow corresponded out with the Civil Service Democratic leader about the military formation (4,5) - {OPEN ORDER
18 - Stolen money is left in the hill station endlessly (4) - {L}{OOT
19 - Force at the tip-off the holy book can be seen (7) - {VIS}{
20 - Colours in a streamer (6) - BANNER ?
21 - Blackberry regularly used by the pastry chef (5) - {B}{A}{K}{E}{R}
23 - Deal with a threat unexpectedly out of the house (5) - T
24 - Show off the crown around the front of the warehouse (4) - CROW Anno pending