Complete
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7 9 11 14 18 21 1 24 2 12 3 19 22 4 13 17 15 5 16 20 6 10 23 8
  1. 1a Widespread butterfly with orange-brown wings (7,4)
  2. 9a Qualm (9)
  3. 10a Suitable (3)
  4. 11a Supercharger (5)
  5. 13a Baseball position behind home plate (7)
  6. 14a Talk tearfully (6)
  7. 15a Voluntary (6)
  8. 18a Not in any place (7)
  9. 20a Professional funny man (5)
  10. 21a Situated towards the stern (3)
  11. 22a According to general belief (9)
  12. 24a Third place gong (6,5)
  13. 2d Buffoon (3)
  14. 3d Nauseating (7)
  15. 4d Indicate (6)
  16. 5d Set fire to (5)
  17. 6d Muscular partition between thorax and abdomen (9)
  18. 7d US national history museum in Washington DC (11)
  19. 8d Extinct flying reptile — dotty carpel (anag) (11)
  20. 12d Drops from the sky (9)
  21. 16d Typical menswear item (7)
  22. 17d Moving movie (6)
  23. 19d Houston-based gas and oil company, destroyed when fraud was revealed 2001 (5)
  24. 23d Molecule containing organisms' genetic code (1,1,1)