Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Ten-armed oval-bodied marine mollusc (10)
  2. 7a One way to bowl or serve (8)
  3. 8a Special influence (4)
  4. 9a Place of damnation (4)
  5. 10a Blow up (7)
  6. 12a Dance venue (11)
  7. 14a Additional game to determine the winner (4-3)
  8. 16a Consideration when dealing with others (4)
  9. 19a Two-masted sailing boat (4)
  10. 20a Formal written exposition (8)
  11. 21a Small figure of a person operated from above with strings (10)
  12. 1d Breeze — picnic (5)
  13. 2d Latticework for supporting plants (7)
  14. 3d Lounge around (4)
  15. 4d Fictional criminal mastermind (with a moustache?) (2,6)
  16. 5d Pigment derived from 1 across (5)
  17. 6d Epidemic disease with a high death rate (6)
  18. 11d Coloured paper thrown on festive occasions (8)
  19. 12d Canadian currency (6)
  20. 13d Group of four (7)
  21. 15d Resort city in the Crimea, where Stalin, Roosevelt and Churchill conferred in February 1945 (5)
  22. 17d Discernment (5)
  23. 18d Academic administrator (4)