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