She’s a delight (3)
I believe the answer is:
joy
This clue is a double definition.
'she's' is the first definition.
'a delight' is the second definition.
('joy' can be a synonym of 'delight')
(Other definitions for joy that I've seen before include "Great happiness" , "Elation" , "Delight" , "Rapture" , "Intense gladness" .)