Burrowing marsupial (6)
I believe the answer is:
wombat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">burrowing marsupial</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wombat that I've seen before include "Bear-like marsupial" , "Burrowing animal" , "Tailless marsupial down under" , "Australian burrowing marsupial" , "Australian resident" .)