Thrashing (7)
I believe the answer is:
beating
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">thrashing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that thrashing can be written as beating)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for beating that I've seen before include "Overcoming (a problem)" , "Defeating; thrashing" .)