Beat the wheat (6)
I believe the answer is:
thresh
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">beat the wheat</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 thresh that I've seen before include "Beat seeds out of grain" , "Separate corn from husks by beating" , "Beat out grain from husks of corn" , "Scots rush" , "Beat grain or make violent movements" .)