Scarf used to deaden sound (7)

I believe the answer is:

muffler

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'scarf' is the definition.
(I know that muffler is a type of scarf)

'to deaden sound' is the wordplay.
'to deaden' becomes 'muffle' (synonyms).
'sound' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'muffle'+'r'='MUFFLER'

'used' acts as a link.

Can you help me to learn more?

(Other definitions for muffler that I've seen before include "Wrap or scarf worn round the neck" , "Thick scarf - silencer (US)" , "Sound deadener" , "Kind of scarf" , "Warming garment" .)

I've seen this clue in The Irish News.

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