Crossword Genius

One bent on crime (5)

Ross

I believe the answer is:

crook

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'one bent' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(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" .)

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