Complete
00:00:00
7 9 13 16 5 18 1 10 2 8 15 14 3 12 11 4 17 6
  1. 5a In a difficult situation — under siege (11)
  2. 7a Long hard journey on foot (4)
  3. 8a Brief and precise (8)
  4. 9a Whim (7)
  5. 11a Passenger vessel operating on a regular schedule (5)
  6. 13a City in Somerset (5)
  7. 14a Produce a regular throbbing sensation (7)
  8. 16a Roman silver coin — is unread (anag) (8)
  9. 17a Pointed front part of a ship (4)
  10. 18a It let losers (anag) — spread rumours (4,7)
  11. 1d Anti-aircraft fire (4)
  12. 2d Ankle-length garment worn by priests and choristers (7)
  13. 3d Inkling (5)
  14. 4d Ruffians (8)
  15. 5d Mourning (11)
  16. 6d Commemorative awards (11)
  17. 10d Trusty (8)
  18. 12d US detective (informal) (7)
  19. 15d Booth (5)
  20. 17d Straight-laced (4)