Was too bright and is lowered (6)
I believe the answer is:
I believe this clue is a double definition.
'was too bright' is the first definition.
(I've seen this before)
'is lowered' is the second definition.
(I've seen this before)
'and' is the link.
(Other definitions for glared that I've seen before include "Lowered" , "Was too bright" , "Looked angrily" , "Glowered" , "Stared fiercely" .)