Hear about married quarters (5)
I believe the answer is:
harem
'quarters' is the definition.
(harem is a kind of quarters)
'hear about married' is the wordplay.
'about' indicates an anagram.
'married' becomes 'm' (abbreviation, e.g. in genealogy).
'hear' is an anagram of 'hare'.
'hare'+'m'='HAREM'
(Other definitions for harem that I've seen before include "Female living quarters in a Muslim household" , "Women's quarters in a Muslim house" , "Where many wives" , "Quarters occupied by women by Muslim household" , "House of concubines" .)