Crossword Genius

Tiny bit (4)

Ross

I think it could be either:

iota

atom

(Other definitions for iota that I've seen before include "Gr. letter; small amount" , "(Not one) little bit" , "Greek letter of little value" , "Tiny piece" , "Extremely small amount" .)

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