Complete
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1 9 11 15 21 23 12 2 16 3 13 4 8 10 17 22 24 5 18 6 19 14 7 20
  1. 1a Picasso and Braque, for instance (7)
  2. 8a Travesty (7)
  3. 9a Rotate (7)
  4. 10a Confuse (7)
  5. 11a ___ Bell, Emily Brontë's pen name (5)
  6. 13a Increasingly powerful (9)
  7. 15a Consequences (9)
  8. 18a Shine (5)
  9. 21a Tense up (7)
  10. 22a Repeat (7)
  11. 23a Nonmetallic element used as a semiconductor in transistors (7)
  12. 24a Mini racing cars (2-5)
  13. 1d Jinx (5)
  14. 2d Two surfaces meeting at an angle other than 90º (5)
  15. 3d Altruistic behaviour (4-9)
  16. 4d Offering beautiful countryside views (6)
  17. 5d Source of great irritation (4,2,3,4)
  18. 6d Saffron-flavoured dish made of rice with shellfish and chicken (6)
  19. 7d Rich and glamorous travellers (3,3)
  20. 12d Idle — common sense (4)
  21. 14d Winged goddess of victory (4)
  22. 15d Weigh up (6)
  23. 16d Cold pudding (6)
  24. 17d Canopy (6)
  25. 19d Committee head (5)
  26. 20d Yorkshire city, where Alan Bennett was born (5)