"Purity / Is obscurity" poet Ogden (4)

I believe the answer is:

nash

(Other definitions for nash that I've seen before include "new wood" , "Ogden --, author" , "Famous dandy, Beau --" , "John -, English architect, designed Regent's Park" , "Famed English architect" .)

I've seen this clue in The Washington Post.

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