Vacillates (6)
(Other definitions for dithers that I've seen before include "Flaps, wavers" , "Hesitates indecisively" .)
(Another definition for yoyos that I've seen is " Toys".)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">vacillates</span>' is the definition.<br/ ><span class="explanation-format__explanation">('waver' can be a synonym of 'vacillate')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for wavers that I've seen before include "Dithers" , "Vacillates" .)