Make more coarse (7)
I believe the answer is:
roughen
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make more coarse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for roughen that I've seen before include "Render coarse" , "Make less smooth" , "rasp" , "Make irregular" , "Make (surface) uneven" .)