Cryptic crossword clue
Under top of glass eye, a long wiggly line 9

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

I've seen this crossword clue in The Guardian
G
E
N
E
A
L
O
G
Y

Buddy explains!

The straight part
We know that "line" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case line = genealogy.
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 GENEALOGY mean?

GENEALOGY noun
  1. The descent of a person, family, or group from an ancestor or ancestors; lineage or pedigree.
  2. A record or table of such descent; a family tree.
  3. The study, and formal recording of such descents.

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