Contest of speed (4)
I believe the answer is:
race
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">contest of speed</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for race that I've seen before include "Run, dash" , "Care about contest" , "Run fast" , "Breed" , "water" .)