Motor fuel (6)
(Other definitions for petrol that I've seen before include "Liquid fuel" , "Fuel for road vehicles" , "The juice" , "Gasoline" , "Common car fuel" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">motor fuel</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 diesel that I've seen before include "Motor fuel" , "Engine fuel" , "Type of fuel oil" , "Rudolf __ , French-born German engine inventor, d.1913" , "Train perhaps" .)