Diagram often accompanied by a photo (5)

I believe the answer is:

graph

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'diagram' is the definition.
(I know that graph is a kind of diagram)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for graph that I've seen before include "Plotted diagram" , "Diagram showing relationships between things" , "Drawing showing relationship between quantities" , "A plotted chart" , "Geometrical diagram" .)

I've seen this clue in the Evening Standard.

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