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 Possible result of muddling one’s words (11)
  2. 7a Tempting prospect (4)
  3. 8a Curved row of houses (8)
  4. 9a Flabbergast (7)
  5. 11a Hooligan (5)
  6. 13a Catchy song (5)
  7. 14a Pain-relieving drug (7)
  8. 16a Unknown individual (8)
  9. 17a Face cloth? (4)
  10. 18a Put an end to something (4,3,4)
  11. 1d Stick together (4)
  12. 2d Explain in detail (7)
  13. 3d Sheltered spot outside (5)
  14. 4d Reveal (8)
  15. 5d Climber’s ultimate goal (8,3)
  16. 6d Hard to grasp (4-7)
  17. 10d Pathetic (8)
  18. 12d One’s getting on (a ship or aircraft) (7)
  19. 15d Form of quartz with coloured bands (5)
  20. 17d Mouselike rodent (4)