Crossword Genius

An upper member's joint (5)

Ross

I believe the answer is:

elbow

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'joint' is the definition.
(joint of the body)

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

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(Other definitions for elbow that I've seen before include "part of the body" , "push" , "Dismissal?" , "Arm joint, more power to it" , "Barge" .)

I've seen this clue in the Evening Standard.
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