Crossword Genius

Prefix with friendly (3)

Ross

I believe the answer is:

eco

'prefix with friendly' is the definition.
(I've seen this in another clue)

This is all the clue.

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

I've seen this clue in the LA Times and The New York Times.
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