The most common and most likely answer to this crossword clue is the 6 letter word USENET
U
S
E
N
E
T
More clues leading to the result USENET
- Internet facility providing e-tunes possibly?
- Lots of online groups offering advice to fisherman?
- American anger once over online depository for world news
- d Newsgroup inductees energetically screening CID out
- States opinion — initially worthless — in online forum
- See nut’s ridiculous computer collection
- Messaging system seen hacked in Utah
- Newsgroups suitable for all developing teens
- You hear teens are upset with precursor of world wide web
- Hire land for electronic bulletin board
Buddy explains!
The straight part
We know that "Messaging system" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case messaging system = usenet.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.