Gleeful (6)
I believe the answer is:
elated
'gleeful' is the definition.
(I know that gleeful can be written as elated)
This is all the clue.
(Other definitions for elated that I've seen before include "Jubilant, quite chuffed" , "Euphoric" , "Exultant" , "Hyped up" , "Filled with joy and pride" .)