Australian marsupial (which Americans begin with an 'O') (6)

I believe the answer is:

possum

(Other definitions for possum that I've seen before include "Marsupial - play it to feign sleep" , "American marsupial (that plays dead?)" , "Small furry Australian marsupial" , "The Australasian phalanger" , "Australian marsupial with dense fur and a long tail" .)

I've seen this clue in The Guardian.

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