Crossword Genius

Letter after chi (3)

Ross

I believe the answer is:

psi

'letter after chi' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for psi that I've seen before include "Pounds per sq. in. (abbr.)" , "foreign letter" , "letter from abroad" , "Greek character" , "one employed by Socrates?" .)

I've seen this clue in the Universal, the USA Today and The Wall Street Journal.
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