Loser in a fabled race (4)
I believe the answer is:
hare
'loser in a fabled race' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hare that I've seen before include "Herbivore" , "Mammal like a large rabbit" , "who often got stiff?" , "Sect: -- Krishna" , "Animal like large rabbit - let it sit" .)