Complete
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1 8 10 13 17 21 24 2 18 3 12 11 4 16 22 14 5 9 20 19 6 15 7 23
  1. 1a Grit sweeper on? (anag) — it makes driving easier (5,8)
  2. 8a Sincere — humourless (7)
  3. 9a Tree with orange-red berry-like fruits (5)
  4. 10a Peak (4)
  5. 11a Savaged (4,4)
  6. 13a Hergé's adventurous young Belgian reporter (6)
  7. 14a Put the ball in the net (6)
  8. 17a Branch of mathematics (8)
  9. 19a Substance taker (4)
  10. 21a Excuse (5)
  11. 22a Treating badly (7)
  12. 24a In a lackadaisical fashion (4-9)
  13. 1d Fruit or meat dish (3)
  14. 2d Labourer (7)
  15. 3d Regrets (4)
  16. 4d Italian painter of the Venetian school, patronised by Philip II of Spain (6)
  17. 5d Wife of Orpheus (8)
  18. 6d From Des Moines? (5)
  19. 7d Explosive invented in 9th-century China (9)
  20. 10d Signature (9)
  21. 12d Accompaniment at mealtime (4,4)
  22. 15d Quash (7)
  23. 16d Misprints in a book (6)
  24. 18d Type of bay window (5)
  25. 20d Sculpture — ruined (4)
  26. 23d Writer of The Beggar's Opera (3)