Complete
00:00:00
7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a Singular visual aid? (7,4)
  2. 7a Short and sharp (4)
  3. 8a Artificial — as tinder (anag) (8)
  4. 9a Hidden away (7)
  5. 11a Frivolous — unstable (5)
  6. 13a Japan's capital before 1868 (5)
  7. 14a Corpulent (7)
  8. 16a Majestic (like the Twelfth of August for some?) (8)
  9. 17a Cause serious injury (4)
  10. 18a Where spivs trade? (5,6)
  11. 1d Irritating insect (4)
  12. 2d Ian ___ , former First Minister of Northern Ireland, d. 2014 (7)
  13. 3d Exacting (5)
  14. 4d Scornful mockery (8)
  15. 5d Out-of-town social venue (7,4)
  16. 6d No pennypincher! (11)
  17. 10d It's half a weekend (8)
  18. 12d Official — guide (7)
  19. 15d Swaggering (5)
  20. 17d Device used in recording (informal) (4)