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 Excessively large amount (11)
  2. 7a One of the seven deadly sins (4)
  3. 8a In an off-hand manner (8)
  4. 9a Loose-fitting dress without a waist (7)
  5. 11a Ice cream portion (5)
  6. 13a Extra payment (5)
  7. 14a Minerva, for example (7)
  8. 16a Bat-and-ball game (8)
  9. 17a Make a reservation (4)
  10. 18a Unit of area (6,5)
  11. 1d Remove the ovaries of a female animal (4)
  12. 2d Exact (7)
  13. 3d Partially melted snow (5)
  14. 4d Paid for (8)
  15. 5d Occurring at the same time (11)
  16. 6d First US national park, 1872 (11)
  17. 10d Lugubrious (8)
  18. 12d Disgusting — ie moons (anag) (7)
  19. 15d Acquire knowledge (5)
  20. 17d Wagers (4)