Prefix with "logical" (3)

There are a few possibilities for this:

Which length description are you looking for?:

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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.