Cryptic crossword clue
Untimely errors made by chairman’s son 12

The most common and most likely answer to this crossword clue is the 12 letter word ANACHRONISMS

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Untimely errors" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case untimely errors = anachronisms.
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 ANACHRONISMS mean?

ANACHRONISMS noun
  1. A chronological mistake; the erroneous dating of an event, circumstance, or object.
  2. A person or thing which seems to belong to a different time or period of time.

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