Crossword Genius

Seventh Greek letter (3)

Ross

I believe the answer is:

eta

'seventh greek 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 "Something like 10 [RHO]" , "European separatists, initially" , "When's end of journey predicted" , "Militant Basque organisation - Greek letter" , "Greek letter E; estimated time of arrival (abbr.)" .)

I've seen this clue in The Wall Street Journal, The Times, The Telegraph and the King Feature Syndicate.
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