Looked through narrowed eyes (6)
I believe the answer is:
peered
'looked through narrowed eyes' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for peered that I've seen before include "Looked searchingly" , "Having been made a Lord < examined" , "Looked closely" , "Look searchingly" , "Looked through narrowed eyes" .)