Actor's claims about women's quarters (6)
I believe the answer is:
harems
'women's quarters' is the definition.
(I've seen this in another clue)
'actor's claims about' is the wordplay.
'actor's' becomes 'ham's' (ham is a kind of actor).
'claims' means one lot of letters goes inside another.
'about' becomes 're' ('re' means regarding or about).
'hams' enclosing 're' is 'HAREMS'.
(Other definitions for harems that I've seen before include "quarters reserved for females" , "Wives' associations" , "Seraglios, women's quarters in Muslim household" , "Masher found in quarters of Muslim women" .)