Crossword Genius

Letter before chi

Ross

I believe the answer is:

phi

'letter before chi' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for phi that I've seen before include "Greek letter, equivalent to F" , "Greek character" , "Letter from the Balkans" , "21st Greek letter" , "Greek letter; hip (anag.)" .)

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