Burn brightly (5)
I believe the answer is:
blaze
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">burn brightly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for blaze that I've seen before include "glare" , "Burn brightly" , "White mark on horse's face" , "Pioneer" , "rage" .)