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 The Yardbirds' guitarist, Jeff (4)
  2. 3a Bruschetta or soup, perhaps (8)
  3. 9a White metallic element (Ca), essential in bones and teeth (7)
  4. 10a Ancient Roman's country house (5)
  5. 11a Flag (5)
  6. 12a Muslim leader (6)
  7. 14a Too sure of oneself? (13)
  8. 17a Puzzle involving the numbers 1 to 9 (6)
  9. 19a Synthetic fabric invented in 1938 (5)
  10. 22a Something worn around the head or neck and shoulders (5)
  11. 23a Any number that is not a fraction (7)
  12. 24a Belief system (8)
  13. 25a Stick around (4)
  14. 1d Theatrical scenery (8)
  15. 2d Jacqueline du Pré's instrument (5)
  16. 4d Protracted (4-9)
  17. 5d Composer of the orchestral piece, Boléro, d. 1937 (5)
  18. 6d Oval (7)
  19. 7d Glance quickly over (4)
  20. 8d Lust for Life, for example (6)
  21. 13d Large venomous fish — it's angry (anag) (8)
  22. 15d Train (7)
  23. 16d Fire (6)
  24. 18d Entrails (5)
  25. 20d Frivolous — insubstantial (5)
  26. 21d Capital of a north-west Italian province, known for its sparking wine (4)