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