Blue feathers - hate red variety (11)
I believe the answer is:
downhearted
'blue' is the definition.
(thesaurus)
'feathers hate red variety' is the wordplay.
'feathers' becomes 'down' (down is a kind of feathers).
'variety' indicates anagramming the letters.
'hate'+'red'='hatered'
'hatered' with letters rearranged gives 'hearted'.
'down'+'hearted'='DOWNHEARTED'
(Other definitions for downhearted that I've seen before include "Sad" , "Dejected" , "Depressed" .)