The most common and most likely answer to this crossword clue is the 10 letter word DISCLOSURE
I've seen this crossword clue in The Daily Telegraph
D
I
S
C
L
O
S
U
R
E
More clues leading to the result DISCLOSURE
- 50 gatecrashing party certain to gain admission
- First to limbo dance outside — absolute revelation
- Look certain to support record supplying revelation
- An opening revelation
- Revelation aid finally is ending
- Leak of crude oil messed with skin of seals
- Party line being held with certain release of information
- Club certain to accommodate large outing
- Laying bare girl, so convinced about heartless cock-and-bull
- Record roles played around university? A revelation
Buddy explains!

The straight part
We know that "release of information" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case release of information = disclosure.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 DISCLOSURE mean?
DISCLOSURE noun- The act of revealing something.
- The making known of a previously hidden fact or series of facts to another party; the act of disclosing.
- A previously hidden fact or series of facts that is made known.