Support friend in lawful manner (7)
I believe the answer is:
legally
'lawful manner' is the definition.
The answer and definition are not the same part of speech.
'support friend' is the wordplay.
'support' becomes 'leg' (leg is a kind of support).
'friend' becomes 'ally' (synonyms).
'leg'+'ally'='LEGALLY'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for legally that I've seen before include "according to the national regulations" , "without offence" , "As regards the law" , "within the law" , "In a manner approved by law" .)