Flay – fruit peel (4)
I believe the answer is:
skin
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">flay</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that flay is a kind of skin)</span><br/ ><br/ >'<span class="explanation-format__original">fruit peel</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for skin that I've seen before include "Thin outer layer" , "Outer layer of, eg, apple" , "External surface" , "Fell" , "External membrane of body" .)