Pick up metal for a bargain (5)
I believe the answer is:
steal
'for a bargain' is the definition.
(synonyms)
'pick up metal' is the wordplay.
'pick up' indicates a 'sounds like' (homophone) clue.
'metal' becomes 'steel' (steel is a metal alloy).
'steel' is a homophone of 'STEAL'.
(Other definitions for steal that I've seen before include "Purloin" , "Pinch" , "Whip" , "Shoplift" , "Nick" .)