Gait for a horse (4)
I believe the answer is:
trot
'gait for a horse' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trot that I've seen before include "An elderly woman" , "Left-winger - move at a fair speed" , "moderate movement" , "Clip (horse)" , "Brisk movement" .)