Australian mammal (8)
I believe the answer is:
platypus
'australian mammal' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for platypus that I've seen before include "Australian mammal with duckbill" , "Egg-laying mammal" , "Australian egg-producer" , "Unusual Australian" , "Australian animal with ducklike beak" .)