Cryptic crossword clue
One divulging secrets in three books about the French queen 7

The most common and most likely answer to this crossword clue is the 7 letter word BLABBER

I've seen this crossword clue in The Times
B
L
A
B
B
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Buddy explains!

The straight part
We know that "One divulging secrets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one divulging secrets = blabber.
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 BLABBER mean?

BLABBER noun
  1. A person who blabs; a tattler; a telltale.
BLABBER verb
  1. To blather; to talk foolishly or incoherently.
  2. To blab; to reveal a secret.
  3. To stick out one's tongue.

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