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 Tedious reading material (4)
  2. 3a Derived from a wide range of sources (8)
  3. 9a Seek support (7)
  4. 10a Canal boat (5)
  5. 11a You shouldn't drive over this! (5)
  6. 12a Relating to the back (6)
  7. 14a Inner poise (4-9)
  8. 17a Substantial but dull food (6)
  9. 19a Transparent (5)
  10. 22a Hungarian-born British film director and producer, Alexander, d. 1956 (5)
  11. 23a Go our separate ways (5,2)
  12. 24a Stargazy pie ingredient (8)
  13. 25a City where the Saône joins the Rhône (4)
  14. 1d Negative reaction (8)
  15. 2d Two crotchets (5)
  16. 4d One source of money — discern shapes (anag) (4,9)
  17. 5d Glowing piece in a dying fire (5)
  18. 6d Stretch of land (7)
  19. 7d Teaching both girls and boys (2-2)
  20. 8d Stewart or Graham? (6)
  21. 13d Reptile with a shell (8)
  22. 15d Kind of misprint (7)
  23. 16d Result (anag) — slight sound (6)
  24. 18d The end (5)
  25. 20d Item in a diary, say (5)
  26. 21d Large container for dumping waste (4)