Cryptic crossword clue
Grasped by uncle, somehow, concept of ancient geometry 9

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

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

The straight part
We know that "of ancient geometry" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of ancient geometry = euclidean.
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 EUCLIDEAN mean?

EUCLIDEAN adjective
  1. Adhering to the principles of traditional geometry, in which parallel lines are equidistant.
  2. Of or relating to Euclid's Elements, especially to Euclidean geometry.
EUCLIDEAN adjective
  1. Of or relating to Euclidean zoning.

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