Place for obsolete metal and paper cash in circulation (9)
I believe the answer is:
scrapheap
'place for obsolete metal' is the definition.
(place for scrap metal)
'paper cash in circulation' is the wordplay.
'in circulation' indicates an anagram.
'paper'+'cash'='papercash'
'papercash' is an anagram of 'SCRAPHEAP'.
'and' is the link.
(Other definitions for scrapheap that I've seen before include "Pile of discarded items" , "metal tip" , "Where unwanted items end up" , "Waste pile" , "Pile of discards" .)