Australian mammal (8)
I believe the answer is:
platypus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">australian mammal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(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" .)