Winged horse (7)
I believe the answer is:
pegasus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">winged horse</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 pegasus that I've seen before include "Fish" , "Immortal winged horse of Greek mythology" , "group of stars" , "Constellation in the northern hemisphere near Andromeda and Pisces" , "Winged horse - constellation" .)