Serving great flans up is the plan (9)

I believe the answer is:

stratagem

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'the plan' is the definition.
(stratagem is a kind of plan)

I can't explain the rest of the clue.

(Other definitions for stratagem that I've seen before include "Tactic to gain an advantage" , "Plan to deceive enemy" , "Clever scheme" , "Device" , "A cunning plan or scheme" .)

I've seen this clue in The Daily Express.

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