Jubilant (6)
I believe the answer is:
elated
'jubilant' is the definition.
(I know that jubilant can be written as elated)
This is the entire clue.
(Other definitions for elated that I've seen before include "Delighted, ecstatic" , "Puffed with success" , "Joyful, uplifted" , "Euphoric" , "Ecstatically happy" .)