Abrasive sheet (9)
I believe the answer is:
sandpaper
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abrasive sheet</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 sandpaper that I've seen before include "Abrasive material" , "Means of smoothing wood" , "Abrasive smoother" , "Abrasive sheet (DIY)" , "Material used for smoothing" .)