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 Rightfulness (10)
  2. 7a Alkali metal, Li (7)
  3. 8a Fizzing firework (5)
  4. 10a Weave — air in the lungs (4)
  5. 11a River that flows through the Grand Canyon (8)
  6. 13a Barked in a high-pitched tone (6)
  7. 15a Ally (6)
  8. 17a Tincture of opium — maul UN ad (anag) (8)
  9. 18a The H in GBH (4)
  10. 21a Blanched (5)
  11. 22a Window fitter (7)
  12. 23a Inexplicable (10)
  13. 1d Reveal information (3,2)
  14. 2d Benefit (4)
  15. 3d Drum beaten with the hands (3-3)
  16. 4d Rising in the Rockies, the longest river in North America (8)
  17. 5d Ability to face danger (7)
  18. 6d Providing every detail (4-2-4)
  19. 9d Vodka and tomato juice, with some Worcester sauce (6,4)
  20. 12d Degenerate (8)
  21. 14d Deficiency (7)
  22. 16d Uncouth (6)
  23. 19d Awry (5)
  24. 20d Lower part of an inside wall, finished differently from the rest (4)