Vehicle at home in shed (5)
I believe the answer is:
cabin
'shed' is the definition.
(both can mean a small hut or shelter)
'vehicle at home' is the wordplay.
'vehicle' becomes 'cab' (cab is a kind of vehicle).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'cab'+'in'='CABIN'
'in' acts as a link.
(Other definitions for cabin that I've seen before include "Wooden dwelling" , "place on board" , "One's own room aboard" , "class at sea?" , "Lodge or hut" .)