Rip off a piece of clothing (6)

I believe the answer is:

fleece

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'rip off' is the definition.
(fleecing is a kind of ripping off)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fleece that I've seen before include "thermal garment" , "Gull" , "Defraud in woolly way" , "9ac's coat" , "Outer coat of sheep" .)

I've seen this clue in The Times.

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