The most common and most likely answer to this crossword clue is the 7 letter word LOW-CUT
I've seen this crossword clue in Financial Times
L
O
W
-
C
U
T
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 = low-cut.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 LOW-CUT mean?
LOW-CUT adjective- Cut low, especially (of clothing) so as to reveal part of the breasts.