Crossword Genius

Smallest bit (4)

Ross

I believe the answer is:

iota

'smallest bit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for iota that I've seen before include "very small part" , "Ninth letter of Greek alphabet, small amount" , "Old letter" , "letter from abroad" , "letter from Greece" .)

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