Schematic drawing (7)
I believe the answer is:
diagram
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">schematic drawing</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 diagram that I've seen before include "Simplified representation" , "scheme" , "Explanatory figure" , "Sketch - plan" , "Explanatory illustration" .)