Die in water (5)
I believe the answer is:
drown
'die in water' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for drown that I've seen before include "Perish in water" , "Die by immersion in liquid" , "Flood; kill" , "Submerge, maybe fatally" , "Die by inhaling liquid" .)