The most common and most likely answer to this crossword clue is the 12 letter word ANNOUNCEMENT
A
N
N
O
U
N
C
E
M
E
N
T
More clues leading to the result ANNOUNCEMENT
- Declaration nun once meant to be broadcast
- Article naming word to fix statement
- Broadcast article with part of speech on cover
- Public notice people by junction following a girl and a cat
- Release article on part of speech — stick with it
- Report of an alpine cat seen by followers, contained in New Testament
- Declaration of a new word for something material in construction
- At end of a new part of speech, stick declaration
- An imperial unit intended to be heard in this report
- A new part of speech to reinforce public statement
Buddy explains!

The straight part
We know that "Declaration" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case declaration = announcement.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 ANNOUNCEMENT mean?
ANNOUNCEMENT noun- An act of announcing, or giving notice.
- That which conveys what is announced.
- The content which is announced.