Map, diagram (4)
I believe the answer is:
plan
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">map</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(eg the plans for a building)</span><br/ ><br/ >'<span class="explanation-format__original">diagram</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for plan that I've seen before include "Formulate" , "Road map" , "Scheme, design" , "Contrive" , "Intention or decision about what one is going to do" .)