Contest of strength (3-2-3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contest of strength</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 tug-of-war that I've seen before include "Pulling contest" , "Sporting test of strength" , "Contest of strength" .)
(Another definition for arm wrestling that I've seen is " Trial of strength (over table)".)