Ecstatically happy (6)
I believe the answer is:
elated
'ecstatically happy' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for elated that I've seen before include "Filled with joy and pride" , "Very pleased, quite high" , "Delighted, ecstatic" , "Overjoyed, in high spirits" , "Gleeful" .)