Faint sign (7)
I believe the answer is:
glimmer
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">faint sign</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for glimmer that I've seen before include "Flicker" , "Shine faintly with a wavering light" , "Faint wavering light" , "Shine faintly and waveringly" , "Intimation (of hope?)" .)