More wacky
I believe the answer is:
sillier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">more wacky</span>' is the definition.<br/ ><span class="explanation-format__explanation">('silly' can be a synonym of 'wacky')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for sillier that I've seen before include "More ridiculous" , "More foolish or stupid" , "More fatuous or foolish" .)