Indy 500 competitor (5)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">indy 500 competitor</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 racer that I've seen before include "Bike, perhaps" , "one in a hurry" , "American snake" , "Speedway competitor, perhaps" , "Fast-moving animal" .)