Writhe (6)
I believe the answer is:
squirm
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">writhe</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for squirm that I've seen before include "feel awkward" , "Twist when struggling" , "'Wriggle, writhe (6)'" , "Wriggle in discomfort" , "Wriggle uncomfortably" .)