Migratory thrush (7)
I believe the answer is:
redwing
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">migratory thrush</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 redwing that I've seen before include "Migratory thrush" , "Flyer" .)