Hoof smoother (4)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hoof smoother</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rasp that I've seen before include "Make a grating noise" , "Smoother" , "Coarse file or grating sound" , "Grating noise; file" , "Grate; scrape" .)