Crossword Genius

Support friend in law (7)

Ross

I believe the answer is:

legally

'in law' is the definition.
(I've seen this before)

'support friend' is the wordplay.
'support' becomes 'leg' (leg is a kind of support).
'friend' becomes 'ally' (I've seen this before).
'leg'+'ally'='LEGALLY'

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

I've seen this clue in The Telegraph.
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