Crossword Genius

Letters from central Cairo and Lima possibly (3,4)

Ross

I believe the answer is:

air mail

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

'letters' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'central cairo and lima possibly' is the wordplay.
'central' says to take the centre.
'and' means one lot of letters go next to another.
'possibly' is an anagram indicator.
The middle of 'cairo' is 'air'.
'lima' is an anagram of 'mail'.
'air'+'mail'='AIR-MAIL'

'from' is the link.

Can you help me to learn more?

(Other definitions for air mail that I've seen before include "Letter delivery system" , "It's marked 'par avion'" , "Post sent overseas" , "Letters taken by plane" , "Flying post?" .)

I've seen this clue in The Sun.
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.