Cryptic crossword clue
Growth rings will invalidate one 6

The most common and most likely answer to this crossword clue is the 6 letter word ANNULI

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Buddy explains!

The straight part
We know that "Growth rings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case growth rings = annuli.
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 ANNULI mean?

ANNULI noun
  1. A ring- or donut-shaped area or structure.
  2. The region in a plane between two concentric circles of different radii.
  3. Any topological space homeomorphic to the region in a plane between two concentric circles of different radius.
  4. The ring of the sun not covered by the moon in an annular solar eclipse.
  5. Structure in a fern that consists of differentially thick-walled cells on a sporangium that bend and distort as a result of drying.
  6. The membranous remnants of a partial veil which leaves a ring on the stem of a mushroom.
  7. (oil and gas production) The space contained between the centre well bore and any external tubing. Sometimes used for separated gas flow.

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