Eight sided figure (7)
I believe the answer is:
octagon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eight sided figure</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for octagon that I've seen before include "An eight-sided polygon" , "Eight-sided shape" , "Geometric figure with eight sides" , "Eight-sided object" , "regular form" .)