gritty sheets (9)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
sandpaper
(Other definitions for sandpaper that I've seen before include "Spared pan for the stuff used to prepare surfaces" , "Material used for smoothing" , "Woodworker's abrasive" , "Means of smoothing wood" , "Make smoother" .)