Brown keeps on about cloth used up for jumper (8)

I believe the answer is:

kangaroo

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'for jumper' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

(Other definitions for kangaroo that I've seen before include "Jumping animal" , "Would oak groan badly under the weight of this animal" , "Pouched animal" , "impromptu kind of court" , "Large Australian mammel" .)

I've seen this clue in The Times.

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