Crossword Genius

By which to win at whist? (8)

Ross

I believe the answer is:

trickery

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But I can't explain it at all! Could you help me understand?

(Other definitions for trickery that I've seen before include "Legerdemain" , "Cunning deceit" , "Practice of deception" , "Hocus-pocus" , "Smoke and mirrors?" .)

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