A blow with the fist (5)
I believe the answer is:
punch
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a blow with the fist</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for punch that I've seen before include "Thump" , "Judy's puppet husband" , "Puppet character, drink and tool for making holes" , "Seaside puppet character" , "Sock" .)