Crossword Genius

At the club, are they all arms and legs? (7)

Ross

I believe the answer is:

members

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'legs?' is the definition.
(leg is a kind of member)

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

Can you help me to learn more?

(Other definitions for members that I've seen before include "Joiners" , "People belonging" , "Parliamentarians" , "structural beams?" , "body..." .)

I've seen this clue in the Evening Standard.
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