Swallow feathers (4)
I believe the answer is:
down
This clue is a double definition.
'swallow' is the first definition.
(I've seen this in another clue)
'feathers' is the second definition.
(down is a kind of feathers)
(Other definitions for down that I've seen before include "Depressed - drink" , "Dispirited" , "Fluff - sorrowful" , "Depressed - Irish county" , "Melancholy" .)