Crossword Genius

Properly both a member and a friend (7)

Ross

I believe the answer is:

legally

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'properly both a' is the definition.
I can't judge whether this definition defines the answer.

'member and a friend' is the wordplay.
'member' becomes 'leg' (member can mean a limb).
'and' means one lot of letters go next to another.
'a friend' becomes 'ally' (an ally is a friend or supporter).
'leg'+'ally'='LEGALLY'

Can you help me to learn more?

(Other definitions for legally that I've seen before include "In a manner approved by law" , "according to the national regulations" , "As regards the law" , "without offence" , "abiding by the rules" .)

I've seen this clue in the Evening Standard.
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