Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Criminal backslider (10)
  2. 7a From Honolulu? (8)
  3. 8a Ancient Greece harp (4)
  4. 9a Device for converting sound waves to an electronic signal (abbr) (4)
  5. 10a Depository for records and documents (7)
  6. 12a Line of cloud following an aeroplane (6,5)
  7. 14a Rough strong cider (7)
  8. 16a Solicit(or) (4)
  9. 19a Metallic element, Zn (4)
  10. 20a Three fourteens (5-3)
  11. 21a Pens, pencils, paper etc (10)
  12. 1d Royal domain (5)
  13. 2d Laugh without restraint (5,2)
  14. 3d Murder (2,2)
  15. 4d Regard with reverence (8)
  16. 5d Graceful lass (5)
  17. 6d Fawn (6)
  18. 11d Adipose tissue disappearing in adolescence (5,3)
  19. 12d Unfortunate person (6)
  20. 13d Follower (7)
  21. 15d Full-length (5)
  22. 17d Yellowish-brown (5)
  23. 18d Three together (4)