Star's welcoming wave in Barnet, meeting a hero (8)
I believe the answer is:
superman
'hero' is the definition.
(comic book superhero)
'star's welcoming wave in barnet meeting a' is the wordplay.
'star' becomes 'sun' (the Sun is a star).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'wave in barnet' becomes 'perm' (wave in one's hair or Barnet).
'meeting' says to put letters next to each other.
'perm'+'a'='perma'
'sun' placed around 'perma' is 'SUPERMAN'.
(Other definitions for superman that I've seen before include "Nietzsche created" , "Nietzche's (or fictional) hero" , "comic figure" , "Kent some time" , "Vigilante from the planet Krypton" .)