Blank look (5)
I believe the answer is:
stare
'blank look' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stare that I've seen before include "'Look fixedly, without blinking (5)'" , "Look with fixed gaze" , "Look with fixed eyes" , "Gaze fixedly" , "Gawp" .)