Complete
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7 9 16 17 20 22 1 12 13 2 18 3 10 23 8 11 21 4 14 19 5 15 6
  1. 1a Fill (6)
  2. 4a Excavate (3,2)
  3. 7a Coiled (6)
  4. 8a Marque of sports and luxury cars manufacturer in the UK since 1948 (6)
  5. 9a New Zealand All Blacks' war dance (4)
  6. 10a Swallowed (8)
  7. 12a Malicious behaviour (11)
  8. 17a Fizz (informal) (8)
  9. 19a Old small silver Spanish coin (4)
  10. 20a Scamp (6)
  11. 21a Not a soul (6)
  12. 22a Temporary knot (5)
  13. 23a (Self-)important personage (6)
  14. 1d Parentless children (7)
  15. 2d Mass murder (7)
  16. 3d Quiver (9)
  17. 4d Kind of duck (5)
  18. 5d Greedy guts (7)
  19. 6d Public promenade (6)
  20. 11d Rapid series of ascending or descending notes on the musical scale (9)
  21. 13d Sound equipment fitted over the ears (7)
  22. 14d Flipping performer? (7)
  23. 15d Emergency backup (7)
  24. 16d Heat discolouration (6)
  25. 18d Take illegally (5)