Complete
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1 9 11 14 21 22 24 17 2 15 8 18 3 4 12 23 5 10 16 19 25 6 20 7 13
  1. 1a Green — fruit (4)
  2. 3a Honorary title for a professor retired from active service (8)
  3. 9a Parisian hat (7)
  4. 10a One of twelve panellists (5)
  5. 11a On war (anag) (5)
  6. 12a National dish of offal, suet, oatmeal and seasoning (6)
  7. 14a Sit behind the driver? (4,1,4,4)
  8. 17a Something of no consequence (6)
  9. 19a Shade — ie asp (anag) (5)
  10. 22a Sing like Bing? (5)
  11. 23a Engage as a participant (7)
  12. 24a Religious studies (8)
  13. 25a Very dark (4)
  14. 1d Make deep cuts in (8)
  15. 2d Sound like a cat (5)
  16. 4d Delicious (5-8)
  17. 5d Arrange differently (5)
  18. 6d Rotary engine (7)
  19. 7d Active (for one's age?) (4)
  20. 8d Rupture in smooth muscle tissue (6)
  21. 13d Plan of action (8)
  22. 15d Interactive sing-along entertainment (7)
  23. 16d Breakaway province of Serbia, populated predominantly by Albanians (6)
  24. 18d Last game in a competion (5)
  25. 20d Monty Python actor, Michael (5)
  26. 21d Someone from north of the border? (4)