Triumphantly elated (8)
I believe the answer is:
exultant
'triumphantly elated' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for exultant that I've seen before include "Intensely joyful" , "Triumphant" , "Rejoicing greatly, delighted" , "Triumphantly elated" , "In jubilant mood, rejoicing" .)