Cryptic crossword clue
Chatty daughter gets posh replacement in organisation of Lord Sugar 9

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

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Buddy explains!

The straight part
We know that "Chatty" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case chatty = garrulous.
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 GARRULOUS mean?

GARRULOUS adjective
  1. Excessively or tiresomely talkative.
  2. (of something written or performed) Excessively wordy and rambling.

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