Track athlete (6)
I believe the answer is:
runner
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">track athlete</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 runner that I've seen before include "Horse in a race; shoot" , "Kind of bean is a fast mover" , "Branch from the base of plant that produces new plants" , "Marathon athlete?" , "-- bean, vegetable" .)