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 Newsday, the Universal, the King Feature Syndicate, The New York Times, the LA Times and The Wall Street Journal.
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