Marsupial feature (5)
I believe the answer is:
pouch
'marsupial feature' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pouch that I've seen before include "joey's home" , "Marsupial's baby carrier" , "Container for tobacco or young" , "Bag" , "Kangaroo's pocket" .)