Stunt affected fate (4)
I believe the answer is:
feat
'stunt' is the definition.
(I've seen this in another clue)
'affected fate' is the wordplay.
'affected' indicates an anagram.
'fate' with letters rearranged gives 'FEAT'.
(Other definitions for feat that I've seen before include "Great deed" , "Deed; achievement" , "Significant achievement" , "Remarkable achievement of fate" , "Achievement needing skill, strength, etc." .)