Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Attack with missiles (7)
  2. 8a One more (7)
  3. 9a Yellow viscous oil from animals — in on all (anag) (7)
  4. 10a Origin — see sign (anag) (7)
  5. 11a Decorate (5)
  6. 13a Salutations (9)
  7. 15a First capital of Australia (1901-27) (9)
  8. 18a Quick — reckless (5)
  9. 21a Legislator — treason (anag) (7)
  10. 22a Copy — reach equality with (7)
  11. 23a Greek goddess of the hunt (7)
  12. 24a Struggled in a confused way (7)
  13. 1d Strong lightweight wood (5)
  14. 2d Large oval tropical fruit (5)
  15. 3d Soon enough (3,2,4,4)
  16. 4d Hang — Glenda (anag) (6)
  17. 5d Be impatient for time to pass (5,3,5)
  18. 6d Elected (6)
  19. 7d Decisive moment (6)
  20. 12d Catnap (4)
  21. 14d Special aptitude (4)
  22. 15d Lose (6)
  23. 16d Object's longest dimension (6)
  24. 17d Sartre (anag) — most uncommon (6)
  25. 19d Play for time (5)
  26. 20d Return on investment (5)