Fast cat (7)
I believe the answer is:
cheetah
'fast cat' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cheetah that I've seen before include "Cat renowned for speed" , "Swift large wild cat with spotted coat" , "Fast spotted wildcat - sounds dishonest" , "Fast-running cat" , "16 21 [INDIAN IMPORT]" .)