The most common and most likely answer to this crossword clue is the 7 letter word LETTERS
L
E
T
T
E
R
S
More clues leading to the result LETTERS
- Notes such as A, C and D
- Presumably they permit certain forms of communication
- Characters, those with tenants?
- Pamphlet tersely conveys messages
- Landlords‘ correspondence
- Characters in correspondence
- Latvian queen’s literary culture
- They may indicate a degree of correspondence
- Characters, those renting rooms?
- These characters would be leeches, after blood
Buddy explains!

The straight part
We know that "messages" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case messages = letters.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 LETTERS mean?
LETTERS 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).
- One who lets, or lets out.
- One who retards or hinders.
- Literature (school subject).
- The liberal arts, humanities, learning (broad accumulated cultural knowledge).
- 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.