Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a Have the opposite and damaging effect to that intended (8)
  2. 5a (When citing a reference) in the same place (abbr) (4)
  3. 9a Popular dance music of the 1970s (5)
  4. 10a Thick sugar paste used for icing cakes (7)
  5. 11a Person in their sixties (12)
  6. 13a Orion — pocket watch with a hinged protective lid (6)
  7. 14a Nocturnal wild cat of Central and South America (6)
  8. 17a Noisily aggressive (12)
  9. 20a Rotary engine (7)
  10. 21a Wide — impenetrable (5)
  11. 22a Panache (4)
  12. 23a Log store (8)
  13. 1d Cots, bunks etc — eastern English county (abbr) (4)
  14. 2d Toilet water reservoir (7)
  15. 3d Soft fresh cheese, like thick yogurt (7,5)
  16. 4d Automatic action (6)
  17. 6d Indian dish consisting of vegetables deep fried in batter (5)
  18. 7d Explode (8)
  19. 8d Banged up (12)
  20. 12d Song thrush — short let (anag) (8)
  21. 15d Uncouth (7)
  22. 16d Swimming briefs trademark (6)
  23. 18d Middle East country, capital Damascus (5)
  24. 19d Slide out of control (4)