Sort of court that's run by the unlawful bounder? (8)

I believe the answer is:

kangaroo

This clue is a double definition.

'sort of court that's run by the unlawful' is the first definition.
(a kangaroo court is an illegitimate court)

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

(Other definitions for kangaroo that I've seen before include "Large leaping mammal" , "Pouched animal" , "Large Australian marsupial" , "Illegal court of marsupial origin?" , "One bounces" .)

I've seen this clue in The Times.

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