Blissfully happy (8)
I believe the answer is:
beatific
'blissfully happy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for beatific that I've seen before include "Joyful" , "Angelic, saintly" , "supremely happy" , "Feeling or expressing blissful happiness" , "Saintly, blessed" .)