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