Feather quilt (9)
I believe the answer is:
eiderdown
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">feather quilt</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 eiderdown that I've seen before include "cover when retired" , "Feather quilt" , "thermal insulation" , "Soft quilt filled with duck feathers" , "Find cover" .)