Arm muscle (6)
'arm muscle' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for biceps that I've seen before include "I bend the elbow" , "Arm workers" , "Upper-arm muscle" , "Flexor muscle" , "Contractor" .)
'arm muscle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for triceps that I've seen before include "Muscles" , "Extensor muscle" , "Green citrus fruit" , "Muscle that extends the forearm" , "One stretches out an arm!" .)