Crossword Genius

Letter from nine written in reverse (4)

Ross

I believe the answer is:

iota

This clue might be a double definition.

'letter' is the first definition.
(Greek letter)

'nine written in reverse' is the second definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'from' is the link.

(Other definitions for iota that I've seen before include "Scintilla" , "A little piece" , "European letter" , "Contrivance" , "Ninth letter of Greek alphabet, small amount" .)

I've seen this clue in The Times.
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