Influence female performer? (6)
I believe the answer is:
factor
'influence' is the definition.
(I've seen this before)
'female performer?' is the wordplay.
'female' becomes 'f' (common abbreviation).
'performer?' becomes 'actor' (actor is a kind of performer).
'f'+'actor'='FACTOR'
(Other definitions for factor that I've seen before include "Seven is one for thirty five" , "Reason" , "Circumstances" , "Mathematical quantity" , "Causal contribution to an outcome" .)