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 Expression of surprise (7)
  2. 8a Have a negative effect (on) (7)
  3. 9a Thought through in advance (7)
  4. 10a More grubby (7)
  5. 11a Like Montezuma? (5)
  6. 13a Objectionable (9)
  7. 15a Vapour bath — more atoms (anag) (5,4)
  8. 18a Greek giant with a hundred eyes (5)
  9. 21a Lightly grilled (7)
  10. 22a Carry out (7)
  11. 23a Coastal area between Cannes and Italy (7)
  12. 24a Payment for the right to use someone else's property (7)
  13. 1d Reddish brown — ie sap (anag) (5)
  14. 2d Traditional Sunday joint? (5)
  15. 3d Air force officer (4,9)
  16. 4d Latent (6)
  17. 5d About (13)
  18. 6d Colour of the rainbow (6)
  19. 7d Smart place to live (abbr) (3,3)
  20. 12d Piquancy (4)
  21. 14d Official language of Pakistan (4)
  22. 15d Residential urban district (6)
  23. 16d Develop (6)
  24. 17d That's disappointing! (2,4)
  25. 19d Thin porridge (5)
  26. 20d Disreputable (5)