Feathers on the floor? (4)
I believe the answer is:
down
This clue is a double definition.
'feathers' is the first definition.
(down can mean bird feathers)
'the floor?' is the second definition.
(both can mean to knock to the ground)
'on' is the link.
(Other definitions for down that I've seen before include "Consume (drink), sad" , "Not working (computer)" , "Sad; feathers" , "Where this clue is going" , "Some 13 Acrosses" .)