Crossword Genius

Serene, informally (3)

Ross

I believe the answer is:

zen

(Other definitions for zen that I've seen before include "Form of Buddhism emphasising meditation and intuition" , "Dibdin detective; Jap. Buddhism" , "Form of Buddhism stressing meditation" , "School of Buddhism" , "Form of Buddhism, emphasises meditation" .)

I've seen this clue in The New York Times.
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