Line, say, followed by friendly country in a permissible fashion (7)
I believe the answer is:
legally
'in a permissible fashion' is the definition.
I can't judge whether this defines the answer.
'line say followed by friendly country' is the wordplay.
'line' becomes 'l' (used when specifying particular lines from a poem).
'say' becomes 'eg' (both can mean 'for example').
'followed by' is a charade indicator (letters next to each other).
'friendly country' becomes 'ally' (I've seen this in another clue).
'l'+'eg'+'ally'='LEGALLY'
Can you help me to learn more?
(Other definitions for legally that I've seen before include "abiding by the rules" , "Licitly" , "In a manner approved by law" , "without offence" , "according to the national regulations" .)