Hero’s receding US hairstyle — Yank at heart (8)
I believe the answer is:
superman
'hero's' is the definition.
(comic book superhero)
'receding us hairstyle yank at heart' is the wordplay.
'receding' says the letters should be written in reverse.
'hairstyle' becomes 'perm' (perm is a hairstyle).
'at heart' says to take the centre.
The middle of 'yank' is 'an'.
'us' backwards is 'su'.
'su'+'perm'+'an'='SUPERMAN'
(Other definitions for superman that I've seen before include "Nietzschean or cartoon hero" , "Comic book hero" , "Heroic figure" , "Rescuing male" , "Clark Kent" .)