Complete
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7 14 19 1 9 12 21 2 15 3 11 20 10 4 18 16 5 8 13 6 17
  1. 1a Nominal leader (10)
  2. 7a Notorious (8)
  3. 8a Little devils! (4)
  4. 9a Swimming pool (4)
  5. 10a Lurch (7)
  6. 12a Hypothetical (11)
  7. 14a Pledge (7)
  8. 16a Device for making an electrical connection (4)
  9. 19a US coin (4)
  10. 20a Easy victory (8)
  11. 21a US singer and actor, born Dino Paul Crocetti, d. 1995 (4,6)
  12. 1d Concluding (5)
  13. 2d Cause to be pleased (7)
  14. 3d Mob violence (4)
  15. 4d Hold back in making a decision (8)
  16. 5d Not getting any younger (5)
  17. 6d Attraction — legal process (6)
  18. 11d Porgy and Bess composer, d. 1937 (8)
  19. 12d Tight-fitting undergarment (6)
  20. 13d Exclude as a possibility (4,3)
  21. 15d Joint between two pieces of wood, forming a corner (5)
  22. 17d Gather — reap (5)
  23. 18d __ Fitzgerald, US singer, the Queen of Jazz, d.1996 (4)