Plot developer (7)

I believe the answer is:

schemer

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'plot developer' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'plot developer' is the wordplay.
'plot' becomes 'scheme' (scheming is a kind of plotting).
'developer' becomes 'r' (I can't explain this - if you can you should give a lot more credence to this answer).
'scheme'+'r'='SCHEMER'

Can you help me to learn more?

(Other definitions for schemer that I've seen before include "Plotter, conspirator" , "Person who plots" , "Cunning planner" , "Devious type" , "one inventing plots" .)

I've seen this clue in The Globe and Mail.

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