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