Cryptic crossword clue
Family history buff got lineages wrong 11

The most common and most likely answer to this crossword clue is the 11 letter word GENEALOGIST

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

The straight part
We know that "Family history buff" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case family history buff = genealogist.
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 GENEALOGIST mean?

GENEALOGIST noun
  1. A person who studies or practises genealogy, an expert in genealogy.

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