Motorcyclist (5)
I believe the answer is:
biker
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">motorcyclist</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for biker that I've seen before include "Hell's Angel?" , "Motorcycist" , "Rider" , "Motorcyclist" .)