Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 16 14 8 10 21 5 6 15 7 19
  1. 1a Three-litre champagne bottle (8)
  2. 5a Express anger (4)
  3. 9a Person with a record of failure (5)
  4. 10a Helpful (2,3)
  5. 11a Temperamental (6,6)
  6. 13a Lasso (6)
  7. 14a Direct (6)
  8. 17a Sexually explicit romantic novel or film (6-6)
  9. 20a Electronic reading material? (1-4)
  10. 21a Fit for Charles III? (5)
  11. 22a Underground structure for holding a ballistic missile (4)
  12. 23a Exempt from import tax (4-4)
  13. 1d Shock (4)
  14. 2d Less secure (7)
  15. 3d Charity baked (anag) — something to mark an anniversary (8,4)
  16. 4d Permanently (6)
  17. 6d Australian monolith, a UNESCO World Heritage site (5)
  18. 7d Coming out (8)
  19. 8d Stuff that's been mislaid? (4,8)
  20. 12d They can't keep their mouths shut (8)
  21. 15d Engrave (anag) — small pre-1981 family car (7)
  22. 16d Brass used to decorate furniture (6)
  23. 18d Funny in an odd sort of way (5)
  24. 19d Depressed (4)