Go by horse (4)
I believe the answer is:
ride
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go by horse</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ride that I've seen before include "spin > lift > pedal" , "Travel, by horse say" , "Go by bicycle" , "Travel, on horseback, say" , "Jaunt" .)