Not curved (7)
I believe the answer is:
angular
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">not curved</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 angular that I've seen before include "Having sharp lines and corners" , "with geometric design" , "Sharp-cornered" , "Bony - lean - gaunt" , "Having sharp corners, lacking curves or smoothness" .)