Stares in amazement (5)
I believe the answer is:
gapes
'stares in amazement' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gapes that I've seen before include "Stares at with mouth wide open" , "Opens mouth wide in surprise" , "Looks amazedly into pages" , "Looks on with open mouth" , "seems very surprised" .)