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 US state containing Mount Rush­more National Memorial (5,6)
  2. 7a Silent bad temper (4)
  3. 8a Broad-minded (8)
  4. 9a Heart and soul (7)
  5. 11a Proviso added to an agreement (5)
  6. 13a Extent (5)
  7. 14a Cigarette butts (3,4)
  8. 16a Lesson (8)
  9. 17a Effervescence (4)
  10. 18a Someone from Port of Spain in the West Indies (11)
  11. 1d Ice hockey disc (4)
  12. 2d Cold confection (4,3)
  13. 3d Soil (5)
  14. 4d Appropriate for one's own use (8)
  15. 5d Walled indoor area for a racket and ball sport for two players (6,5)
  16. 6d Two a penny in the United States (1,4,1,5)
  17. 10d Intense elation (8)
  18. 12d Sack for letters (7)
  19. 15d US states that seceded from the Union in 1861 (5)
  20. 17d Turn over (4)