Marsupial that plays dead (7)
I believe the answer is:
opossum
'marsupial that plays dead' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for opossum that I've seen before include "Small Australian marsupial" , "American and Australian marsupial, often with the first letter dropped" , "American marsupial with prehensile tail" , "Tree climber" , "American and Australian marsupial, often abbreviated" .)