Complete
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8 9 11 14 18 22 24 1 2 19 3 13 12 4 10 17 15 5 21 23 20 6 16 7
  1. 1a Illness may be (anag) — a means of mass production (8,4)
  2. 9a Mexican snack (5)
  3. 10a The soul of wit, according to Shakespeare (7)
  4. 11a One may be common or proper (4)
  5. 12a A passport photo, say (8)
  6. 14a Preserve human remains (6)
  7. 15a Involve (6)
  8. 18a Ultimate (8)
  9. 20a Boxing arena (4)
  10. 22a Confine (7)
  11. 23a Happiness (5)
  12. 24a Downside (12)
  13. 2d Knuckle under (7)
  14. 3d Person who has won all four Emmy, Grammy, Oscar and Tony awards (4)
  15. 4d Moved up and down repeatedly (6)
  16. 5d Admitting defeat (8)
  17. 6d Stew or coffee? (5)
  18. 7d Howard Carter, say — Google typist (anag) (12)
  19. 8d Bored (12)
  20. 13d Inopportune (3-5)
  21. 16d Unchanging (7)
  22. 17d Flowering plant of the aster family (6)
  23. 19d George Eliot's actual surname (5)
  24. 21d Share a boundary (4)