Crossword Genius

Elbow benders (6)

Ross

I believe the answer is:

biceps

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'elbow' is the definition.
(thesaurus)

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(Other definitions for biceps that I've seen before include "Large upper arm muscle" , "Arm muscles" , "I bend the elbow" , "Elbow-bending muscle" , "One operating arm" .)

I've seen this clue in the Evening Standard.
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