Explanatory drawing (7)

I believe the answer is:

diagram

'explanatory drawing' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for diagram that I've seen before include "Simplified representation" , "Line drawing" , "scheme" , "Explanatory figure" , "Explatory drawing" .)

I've seen this clue in The Guardian, the King Feature Syndicate, the Irish Times (Simplex) and The Telegraph.

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