horse's fastest gait (6)
I believe the answer is:
gallop
(Other definitions for gallop that I've seen before include "Fastest run of a horse" , "Run fast like horse" , "go quickly" , "Animal's fast pace" , "Fastest pace of horse" .)
I believe the answer is:
gallop
(Other definitions for gallop that I've seen before include "Fastest run of a horse" , "Run fast like horse" , "go quickly" , "Animal's fast pace" , "Fastest pace of horse" .)