Blissful (6)
'blissful' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for elated that I've seen before include "Intensely happy" , "Overjoyed, in high spirits" , "Cock-a-hoop" , "Jubilant, overjoyed" , "Jubilant, quite chuffed" .)
(Other definitions for walking on air that I've seen before include "Highly elated" , "Extremely happy" , "In seventh heaven" .)