... car from the Corn Belt I've overhauled (11)
I believe the answer is:
convertible
'car' is the definition.
(convertible is a kind of car)
'the corn belt i've overhauled' is the wordplay.
'overhauled' is an anagram indicator.
'corn'+'belt'+'ive'='cornbeltive'
'cornbeltive' anagrammed gives 'CONVERTIBLE'.
'from' is the link.
(Other definitions for convertible that I've seen before include "Car with folding top" , "Car with folding roof" , "Type of car" , "Car with detachable roof" , "traded at fixed rate" .)