Learnt, far away, to be friendly (9)
I believe the answer is:
fraternal
'friendly' is the definition.
(I've seen this in another clue)
'learnt far away' is the wordplay.
'away' is an anagram indicator (letters move away from their original places).
'learnt'+'far'='learntfar'
'learntfar' is an anagram of 'FRATERNAL'.
'to be' acts as a link.
(Other definitions for fraternal that I've seen before include "from an association" , "Brotherly" , "Affectionate like brothers" .)