Radiant (5)
I believe the answer is:
aglow
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">radiant</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aglow that I've seen before include "Lit up" , "Giving out a steady light" , "emitting a steady light" , "Illuminated" , "Shining" .)