Affected by ennui (5)
I believe the answer is:
'affected by ennui' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for jaded that I've seen before include "Exhausted - satiated" , "Decadent or worn out" , "Bored, sated" , "Weary from excess" , "Very tired or bored stiff" .)