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 Hold out (6)
  2. 4a Italian after-dinner drink made from the residue of wine-making (6)
  3. 9a Swings and roundabouts etc? (7)
  4. 10a Vitriol (5)
  5. 11a Clean by rubbing hard (5)
  6. 12a North Star (7)
  7. 13a Charades, for example (7,4)
  8. 18a Unidentified object (7)
  9. 20a Gentle reminder (5)
  10. 22a Recorded film (5)
  11. 23a I'm unable to assist (2,3,2)
  12. 24a Soldier in a cavalry regiment (6)
  13. 25a Small oceanic seabird, comes ashore only to breed (6)
  14. 1d Say 'no' (6)
  15. 2d Echo-location (5)
  16. 3d Pasta and meat dish (abbr) (4,3)
  17. 5d French impressionist composer, d. 1937 (5)
  18. 6d 'The quick brown fox jumps over the lazy dog', for example (7)
  19. 7d Virtually (6)
  20. 8d Spraying fertiliser from a plane (4,7)
  21. 14d Lamp-rubbing boy who thus summons a genie (7)
  22. 15d Chocolate and cream filling — a change (anag) (7)
  23. 16d Pivot (6)
  24. 17d Pull back (in horror?) (6)
  25. 19d Loop with running knot (5)
  26. 21d A giving kind of person (5)