1: Remains as the woman goes inside (5)
2: Model unpredictable dial to shake in natural disaster (5,4)
3: Slows down before a drive in a fast lane (4,5)
4: Plant again is worse, unfortunately (5)
5: Unfortunate rot in republic is everlasting (13)
6: Argument in the meeting (5)
7: At first, Sonny and Cher having bizarre duel with one providing slots? (9)
9: Finish suddenly, like an oboe? (1, 4, 2, 3, 3)
13: Public school game on festive occasions (4,5)
15: Edited schematic religious text (9)
16: Study a French instrument - it's a puzzle (9)
20: A supporter starting to mock President Garfield's middle name (5)
21: Impostor made flanking attack (5)
23: Prohibited key rings (5)