Fuel oil (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fuel oil</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 petroleum that I've seen before include "Fossil fuel" , "Source of fuel" , "Crude oil" , "Fuel oil" , "Hydrocarbon oil" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fuel oil</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for kerosene that I've seen before include "Paraffin oil (E, not I)" , "Oil used as fuel in lamps and heaters" , "Sore knee (anag.)" , "Combustible" , "No seeker for American fuel oil" .)