Unusual part for a real actor (4)
I believe the answer is:
rare
'unusual' is the definition.
(I've seen this in another clue)
'part for a real actor' is the wordplay.
'part' indicates a hidden word.
'RARE' can be found hidden inside 'for a real actor'.
(Other definitions for rare that I've seen before include "Scarce or uncommon" , "Very infrequent or scarce" , "Singular, infrequent" , "may be bloody" , "Might steak be" .)