Crossword Genius

Letter after upsilon (3)

Ross

I believe the answer is:

phi

'letter after upsilon' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for phi that I've seen before include "Greek letter sounding F" , "exotic character" , "classic character" , "Greek letter, spoken as f" , "Twenty-first letter of the Greek alphabet" .)

I've seen this clue in the Universal, The New York Times, the Newsday, The Wall Street Journal and the King Feature Syndicate.
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