Spiralled (6)
I believe the answer is:
coiled
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">spiralled</span>' is the definition.<br/ ><span class="explanation-format__explanation">('coil' can be a synonym of 'spiral')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for coiled that I've seen before include "Shaped like a snake or a spring" , "Wound up like a snake or string" , "Curled or wound round" .)