Epistle from landlord? (6)
I believe the answer is:
letter
This clue is a double definition.
'epistle' is the first definition.
(I know that epistle can be written as letter)
'landlord?' is the second definition.
(landlords let property)
'from' acts as a link.
(Other definitions for letter that I've seen before include "Item sent - character" , "It's one of twenty-six" , "Alphabetic symbol" , "A written form of communication" , "who may offer terms to residents?" .)