Film star's double for the hard bits (8)
(Other definitions for stunt man that I've seen before include "Danger stand-in" , "Actor's stand-in" , "Movie star's double" , "Person employed to do difficult feats for actors" , "substitute for star" .)
(Other definitions for stuntman that I've seen before include "actor's stand-in" , "Movie extra who performs dangerous feats" , "Double for a film's dangerous scenes" , "Performer of dangerous feats" , "one with special role in film" .)