1: Intimidated, we tucked into fish (5)
3: The grades of naval seamen (7)
4: People who put their kids to bed in fatigues? (7)
5: Toss a hammer into a nuclear accelerator! (4,7)
6: Complaining ruler gets expression of disgust (7)
7: One American tree growing wild that's very plain (7)
9: Still drunk, sings in a light, rhythmic way (5)
12: Watering devices found in run-down orange sheds (6, 5)
16: Star first overhauls top landholding, bolstered by French capital (7)
17: Bound her, as subject, to a government official (7)
18: Joker idled lazily among ring leaders (7)
19: Evolve from crude Velo predator (7)
20: Bumps into butcher's display of tongue? (5)
23: Bird gets an eminent man (5)