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