To employ a leg man is within the rules (5)

I believe the answer is:

legal

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'within the rules' is the definition.
(I've seen this before)

'to employ a leg man' is the wordplay.
'to employ a leg' becomes 'le' (I can't justify this - if you can you should give a lot more credence to this answer).
'man' becomes 'gal'.
'le'+'gal'='LEGAL'

'is' is the link.

Can you help me to learn more?

(Other definitions for legal that I've seen before include "Relating to jurisprudence" , "Licit" , "Compliant with the law" , "Like some tender" , "Permitted by law" .)

I've seen this clue in the Evening Standard.

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