Crossword Genius

GPS guess (3)

Ross

I believe the answer is:

eta

'gps guess' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for eta that I've seen before include "Greek letter - time due (abbr)" , "Greek letter - Basque nationalist movement" , "European separatists, initially" , "Member of Greek set a" , "Basque separatist movement" .)

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