Home run run (4)
I believe the answer is:
trot
'home run run' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trot that I've seen before include "Fairly fast pace of a horse" , "Move briskly" , "equestrians sometimes associate with rising" , "Horse's gait - extreme leftist" , "Militant socialist (informal)" .)