Friendly legend after a friend, chiefly (7)
I believe the answer is:
affable
'friendly' is the definition.
(similar in meaning)
'legend after a friend chiefly' is the wordplay.
'legend' becomes 'fable' (synonyms).
'after' means one lot of letters go next to another.
'chiefly' says to take the initial letters.
The initial letter of 'friend' is 'f'.
'a'+'f'='af'
'fable' after 'af' is 'AFFABLE'.
(Other definitions for affable that I've seen before include "Congenial, easy to walk" , "Pleasant and friendly in manner" , "benign" , "Polite and friendly" , "Good-natured, sociable" .)