Crossword Genius

Three-syllable letter (4)

Ross

I believe the answer is:

iota

(Other definitions for iota that I've seen before include "Tiny or scarcely detectable amount" , "Tiny bit" , "(Not one) little bit" , "Greek letter of little value" , "Just a jot, from Greek alphabet" .)

I've seen this clue in The New York Times.
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