Wriggle, squirm (6)
I believe the answer is:
writhe
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">wriggle</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that wriggle can be written as writhe)</span><br/ ><br/ >'<span class="explanation-format__original">squirm</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for writhe that I've seen before include "worm" , "Wriggle" , "Twist as in pain" , "6, maybe in agony" , "Twist in agony" .)