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 Large edible plant of the parsley family — a glove (anag) (6)
  2. 4a Edgar Rice Burrough's Viscount Greystoke (6)
  3. 9a Mauna Loa or Stromboli, say (7)
  4. 10a Russian camp for political prisoners (5)
  5. 11a Straight lines from the centre to the perimeter of a circle (5)
  6. 12a Old timer? (7)
  7. 13a Turn the air blue (informal) (3,3,5)
  8. 18a Tiny margin — vibrissa (7)
  9. 20a Chocolate powder (5)
  10. 22a Provide sparingly (5)
  11. 23a Pewter pint pot? (7)
  12. 24a Very dirty place to live (6)
  13. 25a Long (boring) piece of writing (6)
  14. 1d Significant others? (6)
  15. 2d Still legally binding (5)
  16. 3d Crunchy flavoured water ice (7)
  17. 5d Gas — organ (anag) (5)
  18. 6d Extremely large figure (7)
  19. 7d Trivial misgiving (6)
  20. 8d Unselfish — desecration (anag) (11)
  21. 14d Weak point (7)
  22. 15d Using few words (7)
  23. 16d Accepts responsibility (4,2)
  24. 17d Having real estate — came down (6)
  25. 19d No longer working (5)
  26. 21d Make sore by rubbing (5)