Crossword Genius

Mail for landlords? (7)

Ross

I believe the answer is:

letters

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

'mail' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for letters that I've seen before include "Epistles" , "providing digs?" , "Correspondence" , "Characters" , "Literary culture" .)

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