1 UFOs rather uncommon at night? (5,5)
2 Soil additive making grass equally hard (6)
3 One spelling that's audible (5)
4 Greater part of Babylon walls 50% fungus (8)
5 Accidentally deleted this to have failed colleagues (3,3,4,4)
6 Boom box (4)
8 Spill the beans about stupid plan (cringe) for housework (6-8)
9 A weapon for mum to sell (8)
15 English lover has beer while penning long rambling letter (10)
16 Kiss big copper's behind (8)
18 Facing surgery - back surgery - take drug
(8)
22 Girl's bottom filling couch (6)
23 Absence of nitrogen out of rising gas
(5)
24 Build next to fencing over top of dam (4)