1: Sarcastic critic, alas drunk, missing bit of comedy (9)
 2: Put down explosive material about a union member (5)
 3: To initiate into communist units, they carry the vital gas. (3, 5, 5)
 5: Alien in spa written up for 'a display of greenness'? (7)
 6: Fiber extracted from thistles (5)
 7: Pinker and harder to find (5)
 9: Defusing timer incorrectly can lead to this! (13)
 14: God! Get real! There's no point getting upset (3)
 15: Period email feature (3)
 16: No nuns die tormented by lewd insinuations. (9)
 18: Shocks friend overwhelmed by rude slap (7)
 19: A vagrant fishing-boat (7)
 20: Examples of containers (5)
 21: In Germany, the monster returned from the east. (5)
 23: Literary device may be fey? (5)