The most common and most likely answer to this crossword clue is the 6 letter word LETTER
I've seen this crossword clue in Financial Times
L
E
T
T
E
R
More clues leading to the result LETTER
- Character who may offer terms to residents?
- Permissive character?
- Character left better after the bishop's gone
- What might be Beth’s landlord?
- Estate agent, possibly, a character!
- Communication for a landlord?
- Able to remember role of landlord? Exactly right!
- Landlord, 22 from 1 down
- . . . . month starts with this landlord . . . .
- One giving permission, I say?
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does LETTER mean?
LETTER noun- A symbol in an alphabet.
- A written or printed communication, generally longer and more formal than a note.
- The literal meaning of something, as distinguished from its intended and remoter meaning (often contrasted with the spirit).
- (plural) Literature.
- A division unit of a piece of law marked by a letter of the alphabet.
- A size of paper, 8½ in × 11 in (215.9 mm × 279.4 mm, US paper sizes rounded to the nearest 5 mm).
- A size of paper, 215 mm × 280 mm.
- A single type; type, collectively; a style of type.
- To print, inscribe, or paint letters on something.
- (scholastic) To earn a varsity letter (award).
- An identifying initial of the academic institution that is awarded to a member of a varsity team. It is made from structured cloth, and intended to be sewn to a piece of clothing such as a varsity sweater or varsity jacket.
- One who lets, or lets out.
- One who retards or hinders.