Very eager or curious (4)
I believe the answer is:
agog
This clue is a double definition.
'very eager' is the first definition.
(I've seen this before)
'curious' is the second definition.
(I've seen this before)
(Other definitions for agog that I've seen before include "Very far from indifferent" , "Very eager (to see or hear something)" , "Eager and wide-eyed" , "Perfect" , "Mouth open" .)