Fe-male superhero? (4,3)
I believe the answer is:
iron man
'superhero?' is the definition.
'fe-male' is the wordplay.
'fe' becomes 'iron' ('iron' can be a synonym of 'fe').
'male' becomes 'man' (man is a kind of male).
'iron'+'man'='IRON-MAN'
(Other definitions for iron man that I've seen before include "endurance event" , "Endurance competition" , "Tough event" , "one of great strength" , "fellow of great strength" .)