Courtyard (5)
'courtyard' is the definition.
(atrium is a kind of courtyard)
This is the entire clue.
(Other definitions for atrium that I've seen before include "Central courtyard" , "Um, I rat on the chamber of the heart" , "Roman courtyard" , "Central court/hall" , "Central area in a building, open or with a glass roof" .)
'courtyard' is the definition.
(a patio is an outdoor space or courtyard)
This is all the clue.
(Other definitions for patio that I've seen before include "area near house" , "Spanish court" , "Place to sit" , "Exterior paved area" , "inner court" .)