The most common and most likely answer to this crossword clue is the 8 letter word BLABBING
B
L
A
B
B
I
N
G
Buddy explains!
The straight part
We know that "Revealing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case revealing = blabbing.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 BLABBING mean?
BLABBING verb- To tell tales; to gossip without reserve or discretion.
- Gossip; the telling of tales.