Not as bright (6)
I believe the answer is:
dimmer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not as bright</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 dimmer that I've seen before include "Electrical switch" , "Lighting fixture" , "not as smart?" , "Less bright" , "Not so bright or harsh" .)