1: Complain about the horse (3)
3: Crazy to clean sons in awful mess (11)
7: Old physician in sheltered church (5)
8: Fatal crime may lead to damnation (6,3)
11: Ensemble originally formed with ocarina, cello, theremin, euphonium, and tabla (5)
13: Record that it was to insult (2,3,4)
14: Exhausted writer found in street (5)
15: Freshen the atmosphere (3)
16: Tony flipped over English floor covering (5)
17: Writer deserts pea-green match (5)
18: Inflexible yet adjusted (3)
19: Native American involved in drug problem exposed (5)
20: Cemetery's a serious place (9)
21: Miserable raise follows poor grade (5)
22: Curing bad meat in English river (9)
24: Belated top-and-tailing to gladden one's heart (5)
26: Sly dog covers horses for dancers (3-8)
27: Short bloke quietly escaped seaweed (3)