Expectant (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
agog
'expectant' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for agog that I've seen before include "Expecting" , "Wide-eyed and amazed" , "Expectant, eager" , "Awestruck and breathless" , "Keen" .)