The most common and most likely answer to this crossword clue is the 7 letter word UNMASKS
I've seen this crossword clue in The Guardian
U
N
M
A
S
K
S
More clues leading to the result UNMASKS
Buddy explains!
The straight part
We know that "Reveals" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reveals = unmasks.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 UNMASKS mean?
UNMASKS verb- To remove a mask from someone.
- To expose, or reveal the true character of someone.
- To remove one's mask.
- To enable (an interrupt, etc.) by unsetting or setting the associated bit.