Run at a moderate pace (4)
I believe the answer is:
trot
'run at a moderate pace' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for trot that I've seen before include "An elderly woman" , "Radical socialist (abbr) - horse gait" , "Run with short steps" , "Move briskly" , "Go at steady pace" .)