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 Stamp (6)
  2. 4a Otherworldly (6)
  3. 9a Reddish-tinged metal (7)
  4. 10a Bulb part (5)
  5. 11a Less stimulating (coffee) (5)
  6. 12a Starter from seeds? (3,4)
  7. 13a Versatile opener? (8,3)
  8. 18a Red Arrows display? (3,4)
  9. 20a Can go (anag) (5)
  10. 22a Intelligible (5)
  11. 23a Continuation after a stop (7)
  12. 24a Make light (6)
  13. 25a Lovely (anag) (6)
  14. 1d Personify (6)
  15. 2d Rudimentary (5)
  16. 3d Deep (7)
  17. 5d US or Mexican plant (5)
  18. 6d Tango group? (7)
  19. 7d Chilling (6)
  20. 8d Union member of factory staff liaising between managers and employees (4,7)
  21. 14d Port in Pakistan (7)
  22. 15d Don’t ask me! (2,3,2)
  23. 16d Indulge (in one’s own misfortunes?) (6)
  24. 17d Cereal crop (6)
  25. 19d Living boundary (5)
  26. 21d Supporting pillar (5)