Horseback game (4)
I believe the answer is:
polo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">horseback game</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for polo that I've seen before include "Game played in chukkas" , "Sport - mint - explorer" , "Game played on horseback wielding mallets" , "Venetian 19 to Asia, servant to Kublai Khan" , "Horseback sport" .)