Is fair trial impossible in this court? (8)

I believe the answer is:

kangaroo

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'this court?' is the definition.
(kangaroo court is a kind of court)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for kangaroo that I've seen before include "Marsupial (two friends of 19)" , "Pouched mammal" , "One's jumpy" , "Jumping marsupial" , "Bounding marsupial" .)

I've seen this clue in The Hindu.

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