Vigil (4)
I believe the answer is:
wake
'vigil' is the definition.
(I know that wake is a type of vigil)
This is all the clue.
(Other definitions for wake that I've seen before include "(Irish) funeral party" , "Be roused" , "Vigil before (or party after) a funeral" , "Traditional watch over corpse before burial" , "Come to - track of boat" .)