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