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 Not reserved — at Monteverdi's (anag) (13)
  2. 8a Pivotal (7)
  3. 9a French city on the Belgian border (5)
  4. 10a Stick (4)
  5. 11a Strip (8)
  6. 13a Prize (6)
  7. 14a Quality of poignancy (6)
  8. 17a From Asmara in the Horn of Africa (8)
  9. 19a Woe is me! (4)
  10. 21a Elevate (5)
  11. 22a Harsh — radical (7)
  12. 24a Rate at which one masters a new skill (8,5)
  13. 1d __ Kapital or __ Boot? (3)
  14. 2d Something kept as a reminder (7)
  15. 3d Zilch (4)
  16. 4d Innate ability (6)
  17. 5d Signal that the danger's over (3,5)
  18. 6d Small area surrounded by water (5)
  19. 7d Morning snack (9)
  20. 10d A diocese's main church (9)
  21. 12d Considered unlucky by some (8)
  22. 15d Gun case (7)
  23. 16d Guardian (6)
  24. 18d Spanish Mediterranean island (5)
  25. 20d Chagall or Bolan? (4)
  26. 23d One actor's line to get another to do something? (3)