Complete
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1 9 11 16 18 22 24 13 2 14 3 19 8 12 23 4 25 5 10 15 20 6 21 7 17
  1. 1a Of the most contemptible kind (6)
  2. 4a For free (6)
  3. 9a Navigation instrument (7)
  4. 10a South Pacific island country, gaining its independence from New Zealand in 1962 (5)
  5. 11a Bird's resting place (5)
  6. 12a Glowing with joy (7)
  7. 13a Very rich (7,2,2)
  8. 18a Train (7)
  9. 20a Figure out (5)
  10. 22a Person living voluntarily outside their own country (5)
  11. 23a Degrade (7)
  12. 24a Tried (6)
  13. 25a In repose (2,4)
  14. 1d Official agreement (6)
  15. 2d Kind of jet (5)
  16. 3d Latchet (anag) — possession (7)
  17. 5d Flattened to the ground (5)
  18. 6d Kettledrums (7)
  19. 7d Roughly built hut (6)
  20. 8d Bitterness (11)
  21. 14d Sea creature with three hearts (7)
  22. 15d Examine closely (7)
  23. 16d Take into custody (6)
  24. 17d It ripens in a vine pod underground (6)
  25. 19d Saltpetre (5)
  26. 21d Retrogress (5)