Paraffin (8)
I believe the answer is:
kerosene
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">paraffin</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 kerosene that I've seen before include "Paraffin oil (E, not I)" , "No seeker for American fuel oil" , "Combustible" , "Sore knee (anag.)" , "Oil used as fuel in lamps and heaters" .)