Tool exchanged for money (4)
I believe the answer is:
loot
'money' is the definition.
(loot can mean stolen money)
'tool exchanged' is the wordplay.
'exchanged' is an anagram indicator.
'tool' with letters rearranged gives 'LOOT'.
'for' acts as a link.
(Other definitions for loot that I've seen before include "Haul" , "Pillage; money" , "Plunder and ransack" , "Swag, booty" , "Tool found among plunder" .)