Feathery accessory (3)
I believe the answer is:
boa
'feathery accessory' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for boa that I've seen before include "feathers around the neck?" , "Large constrictor snake" , "Long, thin, feathery scarf" , "Large constricting snake" , "Non-venomous snake" .)