A Beautiful Mind is a biography of mathematician John ____ (4)

I believe the answer is:

nash

(Other definitions for nash that I've seen before include "Marble Arch designer" , "John -, Eng. architect" , "new wood" , "Ogden -, US poet, wit" , "Beau --. Ogden --" .)

I've seen this clue in The Sunday Times and The Times.

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