Like gloomy skies (4)
I believe the answer is:
gray
'like gloomy skies' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gray that I've seen before include "An Anatomist; an Elegist" , "Author of ballad opera" , "a bit gloomy for the Americans" , "English poet" , "Elegiac poet" .)