Fabulous racer? (4)
I believe the answer is:
hare
'fabulous racer?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hare that I've seen before include "Rabbit-like creature" , "animal running in fields" , "who often got stiff?" , "Fast-running mammal" , "Timid creature" .)