Crossword Genius

Fourth-to-last Greek letter (3)

Ross

I believe the answer is:

phi

'fourth-to-last greek letter' 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 "classic character" , "Greek character" , "Greek letter in previous answer" , "Greek letter, spoken as f" , "Letter from abroad" .)

I've seen this clue in The Wall Street Journal.
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