Complete
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1 8 11 14 18 20 22 2 19 17 10 3 9 4 16 15 5 21 23 6 12 7 13
  1. 1a Bill — magistrate (4)
  2. 3a Russian woman of a certain age (8)
  3. 8a Highest point (4)
  4. 9a Lazy (8)
  5. 11a Cervantes character (3,7)
  6. 14a Total (6)
  7. 15a Spanish dance (6)
  8. 17a The study of insects (10)
  9. 20a Hoity-toity (3-2-3)
  10. 21a Travel by sea (4)
  11. 22a Not brisk (8)
  12. 23a Crack a joke (4)
  13. 1d Recently acquired and never used before (5-3)
  14. 2d Coiled fossil shell of a mollusc (8)
  15. 4d Building extension (6)
  16. 5d Breaking with convention (10)
  17. 6d Command given to a dog (4)
  18. 7d Affectedly cultured (4)
  19. 10d Arms smuggling (10)
  20. 12d Agreed to (anag) — detract from (8)
  21. 13d Composed of several different languages (8)
  22. 16d Muddled situation that's difficult to get out of (6)
  23. 18d As well as (4)
  24. 19d Cream puff — French cabbage — Chinese imperial dynasty (4)