Ostrich or kangaroo
I believe the answer is:
biped
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ostrich or kangaroo</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 biped that I've seen before include "Two legged creature" , "Two-footed creature" , "One standing on two feet" , "One walking on two legs" , "Girl, say" .)