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 Spectre (10)
  2. 7a Related by blood or marriage (7)
  3. 8a Czech author of The Trial, d. 1924 (5)
  4. 10a Protein from the beans of a plant of the pea family (4)
  5. 11a Middle East city towards which St Paul was travelling when he converted to Christianity (8)
  6. 13a Arrive (informal) (4,2)
  7. 15a Watch over an area by regularly walking around it (6)
  8. 17a Odd (8)
  9. 18a Musical note (4)
  10. 21a Ransack (5)
  11. 22a Supplement to a will (7)
  12. 23a Brawl (4-3-3)
  13. 1d Bother (5)
  14. 2d Impudent (4)
  15. 3d Sketch again (6)
  16. 4d Subtract (4,4)
  17. 5d Military person with authority (7)
  18. 6d Very tall building (10)
  19. 9d Yes, indeed! (10)
  20. 12d Target's centre (8)
  21. 14d Satan (7)
  22. 16d ___ Panza, squire to Don Quixote (6)
  23. 19d Neighbourhood pub (5)
  24. 20d ___ O'Brien, Irish novelist (4)