Strong fire or flame (5)
I believe the answer is:
blaze
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">strong fire</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">flame</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that blaze is a type of flame)</span><br/ ><br/ ></span>
(Other definitions for blaze that I've seen before include "Strong fire" , "Strong flame that burns brightly" , "Burn with a strong flame" , "brilliant" , "Vivid display" .)