Go or walk briskly (4)
I believe the answer is:
trot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">go or 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 "Move at brisk pace" , "(Horse's) pace faster than a walk" , "Left wing" , "Communist - horse pace faster that a walk" , "movement of H [TROT]" .)