Last letter from America? (3)

I believe the answer is:

zee

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

'last letter from america?' is the definition.
(US name for the letter Z)

'letter from america?' is the wordplay.
'letter' becomes 'z'.
'from america?' becomes 'ee' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'z'+'ee'='ZEE'

Can you help me to learn more?

(Other definitions for zee that I've seen before include "Z (US)" , "Zuider --, former North Sea inlet" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.