Ship's trail (4)
I believe the answer is:
wake
'ship's trail' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for wake that I've seen before include "Aftermath" , "Open one's eyes - funeral party" , "Be roused" , "Traditional Irish tribute to corpse before burial, lots of toasts" , "Backwash" .)