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 chi that I've seen before include "Mental projection" , "Greek X" , "One character abroad" , "Greek character" , "Twenty-second Greek letter" .)

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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