Crossword Genius

Preantepenultimate letter (3)

Ross

I believe the answer is:

phi

(Other definitions for phi that I've seen before include "Greek letter; sounds like expression of disgust" , "Twenty First Greek letter, pronounced as f" , "Greek letter in previous answer" , "One Greek" , "Greek letter, spoken as f" .)

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