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 Known everywhere (5-6)
  2. 7a Catch sight of (4)
  3. 8a Certain to succeed (4-4)
  4. 9a Shoe mender (7)
  5. 11a Negotiator (5)
  6. 13a Unusual or dangerous feat (5)
  7. 14a Ensure that (something) gets done (3,2,2)
  8. 16a Two couples together? (8)
  9. 17a These are not 18 (4)
  10. 18a Successful births — he vets nappy (anag) (5,6)
  11. 1d Wear away (4)
  12. 2d Drawn-out journey (7)
  13. 3d Covered with fur (like an ape?) (5)
  14. 4d Canine battle (in the air?) (8)
  15. 5d Third molar (6,5)
  16. 6d Elasticity (11)
  17. 10d Insolvent (8)
  18. 12d Get (7)
  19. 15d World's largest metropolitan area by population (5)
  20. 17d Red, white or rosé? (4)