Crossword Genius

Principle (5)

Ross

(Other definitions for plain that I've seen before include "Unembellished" , "not attractive" , "Treeless expanse" , "open country" , "Simple, unadorned" .)

I've seen this clue in the USA Today, The Irish Independent, The Mirror, The Sun, The Star Tribune, The Telegraph, The Wall Street Journal, the Evening Standard, the Universal, The New York Times, the Penny Press, the King Feature Syndicate and the LA Times.
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