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