Bored feeling (5)
I believe the answer is:
ennui
'bored feeling' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ennui that I've seen before include "boring" , "Boredom, listlessness" , "What's tedious and instils such listlessness" , "Effect of boredom" , "The feeling of being bored" .)