"The Cow" milk/ilk rhymer (4)

I believe the answer is:

nash

(Other definitions for nash that I've seen before include "Famous dandy, Beau --" , "English architect, d. 1835 - American poet, d. 1971" , "Marble Arch designer" , "Ogden --, US humorous poet" , "English architect, d. 1835 - English war artist, d. 1946" .)

I've seen this clue in the Newsday.

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