Intense elation (8)
I believe the answer is:
euphoria
'intense elation' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for euphoria that I've seen before include "Intense happy feeling" , "Irrational high" , "Intense happiness and elation" , "Over-optimism" , "Intense feeling of well-being and elation." .)