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 Student of the origins of the universe (11)
  2. 7a Floating marker (4)
  3. 8a Student of reasoning (8)
  4. 9a Device for clipping papers together (7)
  5. 11a Brawny (5)
  6. 13a Recently married man (5)
  7. 14a In total (3,4)
  8. 16a American songbird (once flying over the White Cliffs of Dover?) (8)
  9. 17a Completely destroy (4)
  10. 18a Boiler (5-6)
  11. 1d Light grey coloured (4)
  12. 2d Rock (7)
  13. 3d Stinky (5)
  14. 4d Rank one above baron (8)
  15. 5d Retaliation (11)
  16. 6d First person to do something entirely new (11)
  17. 10d Belongings (8)
  18. 12d Make happy (7)
  19. 15d Journal (5)
  20. 17d Speed (4)