Antarctic bird (7)
I believe the answer is:
penguin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">antarctic bird</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 penguin that I've seen before include "Black-and-white Arctic bird" , "Chocolate biscuit" , "King or emperor?" , "Flightless seabird" , "Flightless marine bird" .)