Circle segment (3)
I believe the answer is:
arc
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">circle segment</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 arc that I've seen before include "Curved path" , "development of plot" , "Bow" , "Semi-circle" , "Curved part of circle" .)