Glowing coals (6)
I believe the answer is:
embers
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">glowing coals</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 embers that I've seen before include "Remains of coal fire" , "Hot fragments of wood or coal" , "Live coals" , "Glowing coals" , "Pieces in a dying fire" .)