Parking behind copper trophy (3)
I believe the answer is:
cup
'trophy' is the definition.
(cup is a kind of trophy)
'parking behind copper' is the wordplay.
'parking' becomes 'p'.
'behind' is a charade indicator (letters next to each other).
'copper' becomes 'cu' (chemical symbol).
'p' after 'cu' is 'CUP'.
(Other definitions for cup that I've seen before include "Container to drink from - prize" , "Chalice; trophy" , "Sort of cake" , "Beaker" , "Award; mug" .)