1: Nightwear and jersey top added in afterthought (3)
2: Town's rail transport, not express? (9)
3: Part turning two ways (5)
4: Smuggler participating in arms race? (9)
5: Small change comes back as recurring fluctuations (5)
6: One who does not believe in Castro (7)
7: A quaintly pleasing accent (5)
8: Belated top-and-tailing to gladden one's heart (5)
11: Drain off lowest part (5)
15: I bang rock, disturbing snake (4,5)
16: Poor man's right to make powerless (9)
17: Children nicely holding back secret (5)
18: This would make me a lord (7)
20: A revolutionary New England state or an Indian state (5)
21: Express joy in slaughter (5)
24: Biting piece of chocolate with dry exterior (5)
27: Encourage horse led with direction. (3)