Supporter torn accepting this compiler's fare (9)
I believe the answer is:
nutriment
'fare' is the definition.
(nutriment is a kind of food)
'supporter torn accepting this compiler's' is the wordplay.
'supporter' becomes 'nut' (nut can mean a fan or supporter).
'torn' becomes 'rent' (synonyms).
'accepting' is an insertion indicator (inserted letters are accepted).
'this compiler's' becomes 'I'm' ('I'm', referring to the crossword compiler).
'rent' enclosing 'im' is 'riment'.
'nut'+'riment'='NUTRIMENT'
(Other definitions for nutriment that I've seen before include "It sustains" , "Material providing food" , "Nourishing food" , "Sustenance, nourishment" , "diet" .)