Friendly fellow found in a story (7)
I believe the answer is:
affable
'friendly' is the definition.
('affable' can be similar in meaning to 'friendly')
'fellow found in a story' is the wordplay.
'fellow' becomes 'f' (abbreviation - of a society etc.).
'found in' indicates putting letters inside.
'story' becomes 'fable' (fable is a kind of story).
'a'+'fable'='afable'
'f' placed within 'afable' is 'AFFABLE'.
(Other definitions for affable that I've seen before include "Warm and friendly" , "Congenial, easy to walk" , "benign" , "Courteous of pleasantly easy-going" , "Amiable, genial" .)