1: Small piece of fish (3)
2: Become less formal, and recommend accepting trio of Hawkeyes (4,3)
3: Treason destroyed Washington insider (7)
4: Man nuts about tin (7)
5: Revolutionary near the capital (7)
6: Goes up when five score goals (7)
7: Lament the first person heard in good judgment (4,3)
8: Dry out. Heated? Dry out (9)
12: Coach bans macho fooling around (6,3)
14: California owl sounds like being in a partnership of sorts? (7)
15: Machine spindle starting to mistime; also about to begin labouring (7)
16: Picks up job applicant documents (7)
17: Pitman's state goddess (7)
18: So disgusting no-one takes part? (7)
19: Incredibly stoned, taking Intro to Math final (7)
23: Leaders of Orioles and Rangers stick in the dugout? (3)