Complete
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1 8 10 13 16 20 22 2 3 9 19 17 4 15 14 5 12 11 6 21 7 18
  1. 1a Become teetotal (4,3,6)
  2. 8a Response of the bride and groom (1,2)
  3. 9a Sleeve fasteners (9)
  4. 10a Cornish port on the south coast (8)
  5. 11a Turner or Weymouth? (4)
  6. 13a Food for livestock (6)
  7. 14a A strong resentment (6)
  8. 16a Colourless — depressing (4)
  9. 17a Mocking (8)
  10. 20a Make easy to break — IBM letter (anag) (9)
  11. 21a Ball held by sovereign? (3)
  12. 22a Source of frontline medical treatment? (5,8)
  13. 1d Cockney tea leaf? (5)
  14. 2d Well-informed (13)
  15. 3d Keep going (slowly) (4,4)
  16. 4d Feeble — degenerate (6)
  17. 5d Pause during which things are calm (4)
  18. 6d Scottish terrier named after a character in Walter Scott's novel, Guy Mannering — I'd nod in tandem (anag) (6,7)
  19. 7d Catch in a trap (7)
  20. 12d Mention something unpleasant from the past (6,2)
  21. 13d It may conceal something shameful (3,4)
  22. 15d Cuban socialist leader, d. 2016 (6)
  23. 18d Intriguing politicians, say (5)
  24. 19d Well-meaning (4)