Form of motorcycle racing (8)
I believe the answer is:
speedway
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">form of motorcycle racing</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 speedway that I've seen before include "SPORT/GAME" , "used for cycle racing" , "Stadium for motorcycle racing" , "fast-track competition" , "Form of motorcycle racing" .)