Crossword Genius

Letter that's sixth in the Greek alphabet, not last (4)

Ross

I believe the answer is:

zeta

(Other definitions for zeta that I've seen before include "Foreign character" , "6th Greek letter" , "Sixth letter of the Greek alphabet" , "Greek character" , "Welsh actress, Catherine __-Jones, b. 1969" .)

I've seen this clue in The New York Times.
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