Feeling gloomy (4)
I believe the answer is:
dour
'feeling gloomy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dour that I've seen before include "'Sullen, sour (4)'" , "Gloomy-looking, stern" , "Stern and severe looking" , "Severe, stern, gloomy" , "Grim and gloomy-looking" .)