Spiny Australian mammal (7)
I believe the answer is:
echidna
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spiny australian mammal</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for echidna that I've seen before include "Prickly creature" , "Spiny Aus. mammal" , "Oz native" , "Such a beast" , "Insectivorous mammal" .)