Fish-eating bird of prey (6)
I believe the answer is:
osprey
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fish-eating bird of prey</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 osprey that I've seen before include "Fish-eater" , "Flyer" , "Fish-eating raptor" , "Bird from an outsize victim" , "Marine bird of prey" .)