Oblique-angled parallelogram (7)
I believe the answer is:
rhombus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">oblique-angled parallelogram</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 rhombus that I've seen before include "Four-sided figure" , "Diamond shape" , "Special case of parallelogram" , "Large bottle; vessel with spout" , "Type of parallelogram" .)