Corvid circling crop heap (6)
I believe the answer is:
jalopy
'heap' is the definition.
(both can mean an old car)
'corvid circling crop' is the wordplay.
'corvid' becomes 'jay' (jay is a type of corvid).
'circling' means one lot of letters goes inside another (circling can mean going around or containing).
'crop' becomes 'lop' (synonyms).
'jay' placed around 'lop' is 'JALOPY'.
(Other definitions for jalopy that I've seen before include "Rundown old car" , "Ramshackle old car" , "wreck" , "Clapped-out car" , "heap" .)