Rob returns tool (4)
I believe the answer is:
loot
'rob' is the definition.
(thesaurus)
'returns tool' is the wordplay.
'returns' shows that the letters should be reversed in order.
'tool' in reverse letter order is 'LOOT'.
(Other definitions for loot that I've seen before include "Steal goods as spoils" , "Haul" , "Burglar's takings - pillage" , "Steal (goods); money" , "Booty; sack" .)