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