Crossword Genius

Sigma follower (3)

Ross

I think it could be either:

chi

tau

'sigma follower' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for tau that I've seen before include "Greek letter; cross" , "letter from foreigner" , "A subatomic particle" , "character from Athens" , "19th letter of the Greek alphabet" .)

I've seen this clue in the Sydney Morning Herald, the King Feature Syndicate, the LA Times and The New York Times.
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