Crossword Genius

Letter before iota (5)

Ross

I believe the answer is:

'letter before iota' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for theta that I've seen before include "Greek letter equivalent to th" , "character in Marathon" , "Letter from Greece" , "Character from overseas" , "8th letter of the Greek alphabet" .)

I've seen this clue in the USA Today, the King Feature Syndicate, The New York Times, the Universal, the LA Times and the Newsday.
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