Bounder in court, believed to box occasionally (8)

I believe the answer is:

kangaroo

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'bounder' is the definition.
(animal which bounds around)

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

(Other definitions for kangaroo that I've seen before include "Marsupial from down-under" , "Native marsupial Down Under" , "Progress with poor clutch control" , "Leaping marsupial" , "Marsupial that boxes" .)

I've seen this clue in the Evening Standard.

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