Enthralled (4)
'enthralled' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for rapt that I've seen before include "Completely absorbed" , "Absorbed and enchanted" , "Part (anag.)" , "Engrossed, spellbound" , "Enchanted in part" .)
(Other definitions for agog that I've seen before include "Very eager (to see or hear something)" , "In excited eagerness" , "Receptive - wide-mouthed" , "Eager, avid" , "Excitedly eager" .)