Cryptic crossword clue
Feel rule needs changing about new carbon molecule 9

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

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

The straight part
We know that "carbon molecule" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case carbon molecule = fullerene.
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 FULLERENE mean?

FULLERENE noun
  1. Any of a class of allotropes of carbon having hollow molecules whose atoms lie at the vertices of a polyhedron having 12 pentagonal and 2 or more hexagonal faces.
  2. Any closed-cage compound having twenty or more carbon atoms consisting entirely of 3-coordinate carbon atoms.
  3. (by extension) The class of carbon allotropes consisting of tubular carbon molecules (carbon nanotubes) and spheroidal carbon molecules (traditional fullerenes).

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