Extinct bird of Mauritius (4)
I believe the answer is:
dodo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extinct bird of mauritius</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 dodo that I've seen before include "silly person" , "Native of Mauritius" , "one finished?" , "Square" , "Proverbially extinct bird" .)