Lawfully represented by member and friend (7)
I believe the answer is:
legally
'lawfully' is the definition.
('legally' can be a synonym of 'lawfully')
'member and friend' is the wordplay.
'member' becomes 'leg' (I've seen this before**).
'and' says to put letters next to each other.
'friend' becomes 'ally' (I've seen this before).
'leg'+'ally'='LEGALLY'
'represented by' acts as a link.
(Other definitions for legally that I've seen before include "without breaking the law" , "In a manner approved by law" , "without offence" , "according to the national regulations" , "As regards the law" .)