Shine, glimmer (4)
I believe the answer is:
glow
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">shine</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(glow is a kind of shine)</span><br/ ><br/ >'<span class="explanation-format__original">glimmer</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for glow that I've seen before include "Radiate or redden" , "Give out steady light" , "warmth of feeling" , "Gentle, warm light" , "Shine with warmth, emotion" .)