The most common and most likely answer to this crossword clue is the 9 letter word DISCLOSED
I've seen this crossword clue in Financial Times
D
I
S
C
L
O
S
E
D
Buddy explains!

The straight part
We know that "evealed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case evealed = disclosed.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 DISCLOSED mean?
DISCLOSED verb- To open up, unfasten.
- To uncover, physically expose to view.
- To expose to the knowledge of others; to make known, state openly, reveal.
- (of wings) Expanded, spread; (of a winged creature) with its wings extended or spread.