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