Spirit of gloom (5)
I believe the answer is:
shade
I believe this is a double definition.
'spirit' is the first definition.
(thesaurus)
'gloom' is the second definition.
(thesaurus)
'of' acts as a link.
(Other definitions for shade that I've seen before include "Area sheltered from the sun" , "remains" , "Tint; ghost" , "Hue" , "Space sheltered from the sun" .)