Walk briskly (4)
I believe the answer is:
trot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">walk briskly</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 trot that I've seen before include "Go at steady pace" , "Horse's steady pace" , "Left-winger - move at a fair speed" , "Follower of revolutionary" , "Brisk movement" .)