Hundred Acre Wood marsupial (3)

I believe the answer is:

roo

(Other definitions for roo that I've seen before include "Aussie jumper!" , "Marsupial (abbrev.)" , "Diminutive inhabitant of Hundred Acre Wood" , "Young marsupial" , "short jumper" .)

I've seen this clue in The Washington Post Sunday and the Universal.

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