Muffler (5)
I believe the answer is:
scarf
'muffler' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for scarf that I've seen before include "Garment for wrapping; muffler" , "Fabric square" , "Neck covering" , "Garment worn around head or neck" , "Piece of cloth" .)