Crossword Genius

Frat letter (3)

Ross

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3

5

'frat letter' 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 "European separatists, initially" , "Greek character?" , "indicating when flight is due" , "Letter of Greek alphabet" , "Greek letter E; estimated time of arrival (abbr.)" .)

I've seen this clue in the Newsday, the Penny Press and the LA Times.
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