Duck with soft feathers (5)
I believe the answer is:
eider
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">duck with soft feathers</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 eider that I've seen before include "Duck noted for down" , "Sea duck with soft down" , "Reed I make into a duck" , "Type of duck" , "Large sea duck" .)