Kanga's kid (3)
I believe the answer is:
roo
'kanga's kid' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roo that I've seen before include "Jumping marsupial" , "Kanga's child (Pooh)" , "Marsupial (abbrev.)" , "young skipper" , "Australian jumper" .)