Class for actors, say (5)
I believe the answer is:
caste
'class' is the definition.
(caste is a kind of class)
'actors say' is the wordplay.
'actors' becomes 'cast' (I've seen this before).
'say' shows a homophone (sound like).
'cast' sounds like 'CASTE'.
'for' acts as a link.
(Other definitions for caste that I've seen before include "Social group in India" , "Social station" , "Hereditary social class in Hindu society" , "Brahmans for instance" , "Persons with class" .)