Complete
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1 9 12 13 17 20 22 11 2 18 3 23 4 10 16 14 8 21 5 6 15 7 19
  1. 1a One's genetic endowment (8)
  2. 5a Burl __ , American actor, musician and folk song singer, d. 1995 (4)
  3. 9a Lacking in discrimination and sensibility (5)
  4. 10a Into pieces (7)
  5. 11a Construction on a roof for getting rid of smoke (7,5)
  6. 13a Arm of the eastern Mediterranean (6)
  7. 14a Bobbly (6)
  8. 17a This could bring the house down! (8,4)
  9. 20a Apprentice (7)
  10. 21a Reluctant — unwilling (5)
  11. 22a Customary practice (4)
  12. 23a Kit for blokes (8)
  13. 1d White wine from Germany (4)
  14. 2d Swinish driver? (7)
  15. 3d Alighting (12)
  16. 4d Semi-nomadic Berber people of west and south Sahara (6)
  17. 6d Unaged colourless drink (5)
  18. 7d Noticeable (8)
  19. 8d Basics (4,3,5)
  20. 12d Running drink? (3,5)
  21. 15d Latin translation of the Bible, since 1592 the Roman Catholic Church's official text (7)
  22. 16d Nasal explosion? (6)
  23. 18d Pass into law (5)
  24. 19d Thursday's god? (4)