Milne marsupial
I believe the answer is:
roo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">milne marsupial</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for roo that I've seen before include "Small inhabitant of Hundred Acre Wood" , "Jumping marsupial" , "Young marsupial" , "Marsupial (informal)" , "Kangaroo (Austr. colloq.)" .)