Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Puckered (6)
  2. 4a Songbird with streaky brown plumage (5)
  3. 7a Pouch on a belt (6)
  4. 8a Lend a hand (6)
  5. 9a Layer of spinal cartilage (4)
  6. 10a Draw closer (8)
  7. 12a Literal king (anag) — Jack, for example (5-6)
  8. 17a Explosively unstable (8)
  9. 19a Convulsive catching of breath (4)
  10. 20a Niche (6)
  11. 21a Accept as a challenge (6)
  12. 22a In many cases (5)
  13. 23a Pawnbrokers? (6)
  14. 1d Raining heavily (7)
  15. 2d Sunnybrook Farm girl (7)
  16. 3d Home of Warwickshire County Cricket Club (9)
  17. 4d Difficult question (5)
  18. 5d Confidential — Tommy? (7)
  19. 6d Irritable (6)
  20. 11d Ivy League university, chartered in 1746 (9)
  21. 13d Unlawful (7)
  22. 14d Rational (7)
  23. 15d Consequences (7)
  24. 16d Exaggerate (6)
  25. 18d Malicious fire-raising (5)