Pile of discarded metal (9)
I believe the answer is:
scrapheap
'pile of discarded metal' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scrapheap that I've seen before include "Junk" , "To which old iron is consigned, for instance" , "Pile of discarded metal" , "Cap phrase about mound of waste material" , "Where unwanted items end up" .)