Swift current (4)
I believe the answer is:
race
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swift current</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 race that I've seen before include "water" , "Contest; zoom" , "compete to come first" , "Run swiftly" , "descent" .)