Crossword Genius

Greek letter (but not the last one) (4)

Ross

I believe the answer is:

zeta

(Other definitions for zeta that I've seen before include "Spartan character" , "Letter to the Corinthians" , "Foreign character" , "Greek character" , "Welsh actress, Catherine __-Jones, b. 1969" .)

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