Complete
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7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Dramatists (11)
  2. 7a Brought into existence (4)
  3. 8a Credulous (8)
  4. 9a One no longer of significance (3-4)
  5. 11a Animal needing one lump or two (5)
  6. 13a Urban areas (5)
  7. 14a Female deity (7)
  8. 16a Completed (8)
  9. 17a Increase in magnitude (4)
  10. 18a US state capital — a late hassle (anag) (11)
  11. 1d Sewing repair (4)
  12. 2d Walk with an air of self-importance (7)
  13. 3d Aston's footballers? (5)
  14. 4d Had Latin (anag) (8)
  15. 5d Supporter — top organist (anag) (11)
  16. 6d British motor racing circuit (11)
  17. 10d Constitutionally lazy (4,4)
  18. 12d The King of Swing, d. 1986 (7)
  19. 15d Shallow water (5)
  20. 17d Be effusive (4)