Youngster in A.A. Milne books (3)

I believe the answer is:

roo

(Other definitions for roo that I've seen before include "Kanga's child (Pooh)" , "Marsupial (Aus. colloq.)" , "Marsupial (informal)" , "Australian jumper" , "Young marsupial" .)

I've seen this clue in The Wall Street Journal.

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