Diagram showing a good way to play the harp? (5)

I believe the answer is:

graph

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'diagram' is the definition.
(graphing is a kind of diagraming)

'a good way to play the harp?' is the wordplay.
'a good way' becomes 'g' (I am not sure about this - if you are sure you should believe this answer much more).
'to play' indicates anagramming the letters.
'harp' anagrammed gives 'raph'.
'g'+'raph'='GRAPH'

'showing' acts as a link.

Can you help me to learn more?

(Other definitions for graph that I've seen before include "Diagram representing relationships between quantities" , "Visual representation" , "Diagram showing the relationship between variable quantities" , "Plotted diagram" , "Diagram showing relationships between things" .)

I've seen this clue in the Evening Standard.

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