Infernal flames (8)
I believe the answer is:
hellfire
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">infernal flames</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 hellfire that I've seen before include "Infernal flames" , "Eternal punishment" , "worst possible punishment" , "endless torment" , "Punishment in a very hot place" .)