Fine performer creating part (6)
I believe the answer is:
factor
'part' is the definition.
(factor is a kind of part)
'fine performer' is the wordplay.
'fine' becomes 'f' (abbreviation).
'performer' becomes 'actor' (actor is a kind of performer).
'f'+'actor'='FACTOR'
'creating' is the link.
(Other definitions for factor that I've seen before include "Of 15, 3 or 5" , "Influencing circumstance" , "One of two or more integers that can be exactly divided into another" , "Circumstance that contributes toward a result - arithmetically?" , "for a consideration?" .)