Luminous, radiant (7)
I believe the answer is:
glowing
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">luminous</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">radiant</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for glowing that I've seen before include "Radiant" , "Giving out steady light" , "Incandescent" , "Lambent, shining" , "like some worms" .)