Speed contests (5)
I believe the answer is:
races
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">speed contests</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 races that I've seen before include "Competitions; ethnic groups" , "Competitive trials of speed" , "Operates at excessive speed" , "Sprint and marathon?" , "Human groups" .)