A bounder in court? (8)
I believe the answer is:
kangaroo
This clue is a double definition.
'a bounder' is the first definition.
(animal which bounds around)
'court?' is the second definition.
(kangaroo court is a kind of court)
'in' acts as a link.
(Other definitions for kangaroo that I've seen before include "Illegal court of marsupial origin?" , "Pouched mammal" , "impromptu kind of court" , "Large Australian marsupial" , "Progress with poor clutch control" .)