Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a Persistent nuisance (4)
  2. 3a Curved sword (8)
  3. 9a Endurance (7)
  4. 10a Not a single person (2,3)
  5. 11a Biological units (5)
  6. 12a Hostility (6)
  7. 14a American homeopath, arrested for murdering his wife Cora and hanged in London 1910 (6,7)
  8. 17a Support for one who is lame (6)
  9. 19a Heraldic black (5)
  10. 22a Synthetic fabric, resembling silk (5)
  11. 23a Sudden increase (7)
  12. 24a Miscellaneous items (8)
  13. 25a So (4)
  14. 1d Part of an address (8)
  15. 2d Temporise (5)
  16. 4d Royal residence on The Mall in London — cheer on, as clue (anag) (8,5)
  17. 5d (In music) note with a time value of half a whole note (5)
  18. 6d Old-time dance in duple time (3-4)
  19. 7d Smell offensively (4)
  20. 8d Complete disaster (6)
  21. 13d Numbers — steering (anag) (8)
  22. 15d Continue (5,2)
  23. 16d Be adamant (6)
  24. 18d Domingo, Pavarotti or Carreras? (5)
  25. 20d Nativity (5)
  26. 21d Greek god of love (4)