Fabled racer (4)
I believe the answer is:
hare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fabled racer</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 hare that I've seen before include "Long-eared mammal" , "Herbivore" , "Swift mammal" , "Timid creature" , "Rabbit-like animal" .)