Women’s quarters are toured by His Majesty (5)
I believe the answer is:
harem
'women's quarters' is the definition.
(historically, women's quarters in Muslim household)
'are toured by his majesty' is the wordplay.
'toured by' is an insertion indicator (tour can mean to go around).
'his majesty' becomes 'hm' (short for His Majesty).
'are' going inside 'hm' is 'HAREM'.
(Other definitions for harem that I've seen before include "Living quarters of wives in a Muslim household" , "Quarters for women in Muslim household, a seraglio" , "Group of wives" , "women live here" , "Quarters occupied by women by Muslim household" .)