Canter (4)
I believe the answer is:
trot
'canter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for trot that I've seen before include "Slowish run, of horse or person" , "Horse's gait - extreme leftist" , "Go at steady pace" , "An elderly woman" , "Move quite fast" .)