Crossword Genius

A scrap from a letter (4)

Ross

I believe the answer is:

iota

This clue is a double definition.

'a scrap' is the first definition.
(I've seen this before)

'a letter' is the second definition.
(iota is a kind of letter)

'from' acts as a link.

(Other definitions for iota that I've seen before include "Smidgeon" , "Hint" , "Jot or tittle" , "A little piece" , "Trace" .)

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