Pulveriser (6)
I believe the answer is:
pestle
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pulveriser</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for pestle that I've seen before include "Grinder for mortar" , "Mortar's partner?" , "13's grinding partner" , "It grinds in a mortar" , "Small club for use with mortar" .)