Star at fete produced a sensational finish (10)
I believe the answer is:
aftertaste
'a sensational finish' is the definition.
'star at fete produced' is the wordplay.
'produced' is an anagram indicator.
'star'+'at'+'fete'='staratfete'
'staratfete' is an anagram of 'AFTERTASTE'.
(Other definitions for aftertaste that I've seen before include "Lingering sensation in mouth" , "Residue on the palate" , "Unpleasant feeling left behind" , "residual sensation" , "Consumer sensation" .)