Bright spots? (5)
I believe the answer is:
atria
'bright spots?' 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 "Parts of the heart or of Roman houses" , "Open-roofed entrance halls (Roman) - glass-roofed central halls (modern)" , "Upper chambers of the heart" , "Roofed central courts" , "Covered courts" .)