Glint or flare (5)
I believe the answer is:
spark
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">glint</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that glint can be written as spark)</span><br/ ><br/ >'<span class="explanation-format__original">flare</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for spark that I've seen before include "Fragment of a burning substance" , "Electrical discharge" , "Fiery particle" , "Flicker -- provoke" , "Particle of fire" .)