Car in back of garage, say (6)
I believe the answer is:
estate
'car' is the definition.
(type of car)
'back of garage say' is the wordplay.
'back of' says to take the final letters.
'say' becomes 'state' (synonyms).
The final letter of 'garage' is 'e'.
'e'+'state'='ESTATE'
'in' is the link.
(Other definitions for estate that I've seen before include "All of one's assets and liabilities" , "Industrial area" , "Property with considerable land" , "Nakedness" , "The whole of one's possessionsat death" .)