In which those in suits set up precarious scheme? (5,2,5)

I believe the answer is:

house of cards

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

I can't explain the remainder of the clue.

(Other definitions for house of cards that I've seen before include "building that might fall over" , "Flimsy structure" , "Unstable scheme" .)

I've seen this clue in The Times.

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