Crossword Genius

Letter used in teaching Greek (3)

Ross

I believe the answer is:

chi

'letter' is the definition.
(I know that chi is a type of letter)

'in teaching greek' is the wordplay.
'in' indicates a hidden word.
'CHI' can be found hidden inside 'teaching greek'.

'used' is the link.

(Other definitions for chi that I've seen before include "One character abroad" , "foreign character" , "Letter written by European" , "T'ai -, martial art" , "character from Euripides?" .)

I've seen this clue in The Globe and Mail.
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