Prefix with logical (6)

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5 6

eco

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

This is the entire clue.

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

I've seen this clue in the USA Today.

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