A leg man is no criminal! (5)

I believe the answer is:

legal

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'no criminal' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'a leg man' is the wordplay.
'man' becomes 'Al' (man's name).
'leg'+'al'='LEGAL'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for legal that I've seen before include "In accordance with statute" , "In accordance with law" , "Street - (1978 Dylan album)" , "right" , "Compliant with the law" .)

I've seen this clue in the Evening Standard.

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