Skylit hotel lobbies (5)
I believe the answer is:
atria
'skylit hotel lobbies' 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 "Public spaces with galleries" , "Central courts, halls" , "Parts of the heart or of Roman houses" , "Open-roofed courts" , "entrances" .)