Flicker (5)
I believe the answer is:
waver
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flicker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that flicker can be written as waver)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for waver that I've seen before include "Show hesitation, begin to give way" , "Be irresolute; flicker" , "Not be sure of" , "fluctuate" , "Vacillate" .)