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Harsh
sound
of
underwear
rubbing
against
somebody’s
rear
(4)
Harsh sound of underwear rubbing against somebody’s rear (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is harsh sound — a donkey's bray fits that nicely. For the wordplay, you've got BRA (underwear) stuck in front of Y, which is the rear (last letter) of somebody.