Crossword Genius

Extremely small amount (4)

Ross

I believe the answer is:

iota

'extremely small amount' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for iota that I've seen before include "Smidgen" , "Greek letter - minimal amount" , "A little piece" , "Ninthe letter of the Greek alphabet" , "very small part" .)

I've seen this clue in The Times and The Guardian.
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