Crossword Genius

Jot letter to Grecian (4)

Ross

I believe the answer is:

iota

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'jot' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for iota that I've seen before include "Old letter" , "Tiny bit" , "Tiny piece" , "Grain" , "A little piece" .)

I've seen this clue in The Independent.
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