Crossword Genius

Minute portion (4)

Ross

I believe the answer is:

iota

'minute portion' 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 "Grain" , "Greek equivalent of the letter I" , "Trace" , "Smidgen" , "'Very small amount, jot (4)'" .)

I've seen this clue in The Wall Street Journal.
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