Single piece of paper (5)
I believe the answer is:
sheet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">single piece of paper</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 sheet that I've seen before include "Sail-rope on the bed?" , "Piece of linen; ship's rope" , "Piece of linen, paper, etc" , "Piece of paper or bedlinen" , "Page of postage stamps" .)