Extinct flying reptile (11)
I believe the answer is:
pterodactyl
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">extinct flying reptile</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 pterodactyl that I've seen before include "Flying dinosaur" , "Winged reptile of old" , "old flying reptile" , "Flying creature" , "reptile from the past" .)