Be dispirited (4)
I believe the answer is:
mope
'be dispirited' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for mope that I've seen before include "Brood over a poem" , "Become gloomy" , "listless person" , "Be mildly depressed" , "Be apathetic or gloomy about poem" .)