The most common and most likely answer to this crossword clue is the 9 letter word PUBLISHED
I've seen this crossword clue in The Daily Telegraph
P
U
B
L
I
S
H
E
D
Buddy explains!

The straight part
We know that "released" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case released = published.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 PUBLISHED mean?
PUBLISHED verb- To issue (something, such as printed work) for distribution and/or sale.
- To announce to the public.
- To issue the work of (an author).
- To disseminate (a message) publicly via a newsgroup, forum, blog, etc.
- To issue a medium (e.g. publication).
- To have one's work accepted for a publication.
- (of content) To be made available in a printed publication or other medium.
- To convert data of a Web page to HTML in a local directory and copy it to the Web site on a remote system.