Crossword Genius

"Green" prefix (3)

Ross

I believe the answer is:

eco

'green prefix' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for eco that I've seen before include "Umberto --, Italian writer" , "Green prefix" , "Umberto - - , novelist" , "Environmental group" , "Umberto -, Italian author (The Name of the Rose)" .)

I've seen this clue in the USA Today, The New York Times, the Newsday, the Universal, The Wall Street Journal, the LA Times, the Penny Press and the King Feature Syndicate.
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