Crossword Genius

Plan to gain an advantage (9)

Ross

I believe the answer is:

stratagem

(Other definitions for stratagem that I've seen before include "Clever scheme" , "Start game with cunning plan" , "A cunning plan or scheme" , "Crafty manoeuvre" , "A cunning plan or piece of trickery" .)

I've seen this clue in The Independent.
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