Chuffed (5)
(Other definitions for happy that I've seen before include "A not so low" , "One of the Seven Dwarves" , "Fortunate, convenient" , "Blissful" , "Contented" .)
'chuffed' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for glad that I've seen before include "These rags are dressy clothes - happy?" , "bright?" , "Happy, pleased" , "Not sorry" , "Feeling happy" .)