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

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