Crossword Genius

Physicist Mach (5)

Ross

I believe the answer is:

ernst

'physicist mach' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ernst that I've seen before include "He painted" , "artist's name" , "Young partner" , "Surrealist; stern (anag.)" , "Max __; Dadaist" .)

I've seen this clue in the LA Times, The Wall Street Journal and the Newsday.
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