Crossword Genius

Just a little letter from abroad (4)

Ross

I believe the answer is:

iota

I'm a little stuck... Click here to teach me more about this clue!

'letter from abroad' is the definition.
(letter of the Greek alphabet)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for iota that I've seen before include "Contrivance" , "(Not one) little bit" , "Greek letter of little value" , "Just a jot, like Greek letter" , "The smallest possible amount, or the Greek i" .)

I've seen this clue in The Globe and Mail.
Want a hint initially instead of a full solution? Install my app