Wide-eyed (4)
I believe the answer is:
agog
'wide-eyed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for agog that I've seen before include "Awestruck and breathless" , "Expectant and wide-eyed" , "Very curious to hear" , "Open-mouthed" , "Enthusiastic" .)