Beat, pummel (5)
I believe the answer is:
pound
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">beat</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">pummel</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for pound that I've seen before include "Caged poet" , "Beat; money" , "Cars towed to it; hit heavily" , "Powder - 16 oz - 100p" , "Weight - currency - beat - enclosure" .)