Large feather (5)
I believe the answer is:
plume
'large feather' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for plume that I've seen before include "Smoke when rising" , "Conspicuous feather of a bird" , "Bunch of feathers" , "Long cloud of smoke" , "Feather; wisp of e.g. smoke" .)