Implement brought back for money (4)
I believe the answer is:
loot
'for money' is the definition.
(loot can mean stolen money)
'implement brought back' is the wordplay.
'implement' becomes 'tool' (tool is a kind of implement).
'brought back' says the letters should be written backwards.
'tool' in reverse letter order is 'LOOT'.
(Other definitions for loot that I've seen before include "Orton play; money" , "Steal (goods); money" , "Tool found among plunder" , "Tool for plundering" , "Prize" .)