US national bird (4,5)
I believe the answer is:
bald eagle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">us national bird</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bald eagle that I've seen before include "N. American bird" , "US national bird" , "National bird of the USA" , "Flier" , "National emblem of the USA" .)