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