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