One bent on crime (5)
I believe the answer is:
crook
'one bent' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crook that I've seen before include "Bend; criminal; staff" , "Criminal - taken in hand by bishop" , "Fence, perhaps" , "Swindler - crosier - ill (in Australia)" , "Twister" .)