An intriguing plan? (6)

I believe the answer is:

scheme

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'plan?' is the definition.
(scheme is a kind of plan)

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

(Other definitions for scheme that I've seen before include "Secret plan, plot" , "Systematic plan or arrangement" , "Plan; system" , "Wheel and deal" , "Systematic plan, plot" .)

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

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