Simplified drawing (7)
I believe the answer is:
diagram
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">simplified drawing</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for diagram that I've seen before include "A grid, Ma? (Anag)" , "picture" , "Line drawing" , "Chart" , "Explanatory figure" .)