Complete
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6 7 10 13 17 21 23 1 14 2 12 11 3 16 22 15 4 8 20 18 5 19 9
  1. 1a Diamond in April, say? (10)
  2. 7a England, Scotland and Wales (7)
  3. 8a Particularly (5)
  4. 10a Wisecrack (4)
  5. 11a Aeroplane lever (8)
  6. 13a Line on map containing points of equal pressure (6)
  7. 15a Strong outdoor shoe (6)
  8. 17a Surreptitiously (2,3,3)
  9. 18a Move towards take-off (4)
  10. 21a Velvety leather (5)
  11. 22a Feat on motorbike (7)
  12. 23a Uh-oh! (4-1-5)
  13. 1d Pancakes served with caviar and sour cream (5)
  14. 2d Existent (4)
  15. 3d Two-wheeled carriage (6)
  16. 4d State funds (8)
  17. 5d All that’s in a vacuum! (7)
  18. 6d Ever-present (10)
  19. 9d Pesky kid (5-5)
  20. 12d Anonymous (8)
  21. 14d Hard at work (2,3,2)
  22. 16d Inaccurate (6)
  23. 19d Metal mix (5)
  24. 20d Himalayan monster (4)