Ten-sided figure (7)
I believe the answer is:
decagon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ten-sided figure</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for decagon that I've seen before include "10-sided figure" , "Plane shape" , "Ten-sided shape" , "Go, dance on geometric figure with ten sides" , "A polygon -- eg can-do (anag)" .)