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