Waste metal (5)
I believe the answer is:
scrap
'waste metal' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for scrap that I've seen before include "Scuffle" , "Waste metal or slang fight" , "Dispense with - waste material" , "Junk; altercation" , "Axe" .)