Interior courtyards (5)
I believe the answer is:
atria
'interior courtyards' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for atria that I've seen before include "Covered courts" , "Central courts, halls" , "Open-roofed courts" , "Lobbies" , "Central courts (in ancient Rome or shopping arcades)" .)