Marsupial with a ratlike tail (7)

I believe the answer is:

opossum

(Other definitions for opossum that I've seen before include "American arboreal marsupial" , "Thickly furred marsupial" , "Thick-furred marsupial of the Americas" , "Native of America" , "American native" .)

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

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