Ornamental plume (8)
I believe the answer is:
aigrette
'ornamental plume' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aigrette that I've seen before include "Plumed headdress" , "spray" , "Feathered headdress" , "Long plume worn on a hat" , "head cover" .)