Crossword Genius

I as in Ithaca (4)

Ross

I believe the answer is:

iota

'i as in ithaca' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for iota that I've seen before include "Smidgen" , "Just a jot, from Greek alphabet" , "Old letter" , "Scintilla" , "Trace" .)

I've seen this clue in the Universal, the USA Today and the Thinks.com.
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