Marsupial pal of Pooh (3)

I believe the answer is:

roo

(Other definitions for roo that I've seen before include "bounder" , "Young marsupial" , "Marsupial (informal)" , "Kanga's son (Pooh)" , "Kangaroo (Austr. colloq.)" .)

I've seen this clue in The Washington Post.

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