Crossword Genius

Letter before omega (3)

Ross

I believe the answer is:

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

This is all the clue.

(Other definitions for psi that I've seen before include "Twenty-third letter of Greek alphabet" , "Greek letter; pounds per square inch (abbrev.)" , "one employed by Socrates?" , "Pounds per square inch (abbr.); Greek letter" , "foreign letter" .)

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