Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a A later addition (12)
  2. 9a Nine to five? (5)
  3. 10a Medically clean (7)
  4. 11a Disturbance (2-2)
  5. 12a ____ Building, a triangular 22-storey, steel-framed structure on New York's Fifth Avenue (8)
  6. 14a In a strange way (6)
  7. 15a Like Hamlet or Othello? (6)
  8. 18a Nine- to 12-year-olds (8)
  9. 20a Young horse (4)
  10. 22a In progress (7)
  11. 23a Not censored (5)
  12. 24a A sinful pride (anag) — it's said to be psychologically revealing (8,4)
  13. 2d Sink — creator (7)
  14. 3d Lioness written about by Joy Adamson in Born Free (4)
  15. 4d Paths through wild or hilly country (6)
  16. 5d Tentative approach (8)
  17. 6d Large amphibious reptile (abbr) (5)
  18. 7d Specific detail in a set of rules — city chatline (anag) (12)
  19. 8d Designed not to break (12)
  20. 13d North American songbird (seen over the White Cliffs of Dover?) (8)
  21. 16d Italian dumplings (7)
  22. 17d Conundrum (6)
  23. 19d Score of two strokes under par for a golf hole (5)
  24. 21d Swear (informal) (4)