Cryptic crossword clue
Discuss keeping in son, as one tells all 9

The most common and most likely answer to this crossword clue is the 9 letter word CONFESSOR

I've seen this crossword clue in The Daily Telegraph
C
O
N
F
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O
R

Buddy explains!

The straight part
We know that "one tells all" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one tells all = confessor.
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 CONFESSOR mean?

CONFESSOR noun
  1. One who confesses faith in Christianity in the face of persecution, but who is not martyred.
  2. One who confesses to having done something wrong.
  3. A priest who hears confession and then gives absolution

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