Feeling blue (10)
I believe this clue is a double definition.
'feeling' is the first definition.
(atmosphere can mean a feeling or mood)
'blue' is the second definition.
(blue can mean the sky or atmosphere)
(Other definitions for atmosphere that I've seen before include "climate" , "Spirit" , "character" , "We are always enveloped in this" , "blue?" .)
I believe this clue is a double definition.
'feeling' is the first definition.
(melancholy is a kind of feeling)
'blue' is the second definition.
(thesaurus)
(Other definitions for melancholy that I've seen before include "Sad - tendency to depression" , "Long-lasting sadness" , "Cheerless" , "Depressed" , "sombre" .)
'feeling blue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sad that I've seen before include "Melancholy or pitiful" , "Despondent" , "Winter blues, initially" , "Dejected" , "Mournful and depressed" .)
'feeling blue' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for glum that I've seen before include "Long-faced" , "Downcast and gloomy (4)" , "Dispirited, moody" , "Doleful" , "Sad and gloomy" .)