Corpse found in vehicle crossing channel (7)
I believe the answer is:
cadaver
'corpse' is the definition.
('cadaver' can be a synonym of 'corpse')
'vehicle crossing channel' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'crossing' means one lot of letters goes inside another.
'channel' becomes 'dave' (I've seen this before).
'car' going around 'dave' is 'CADAVER'.
'found in' acts as a link.
(Other definitions for cadaver that I've seen before include "Human corpse" , "A kind of corpse" , "Dead human body" , "Human body dissected by medical students" , "Dead body, corpse" .)