Cryptic crossword clue
Line added to grant form scientists know 9

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

I've seen this crossword clue in Financial Times
A
L
L
O
T
R
O
P
E

Buddy explains!

The straight part
We know that "form scientists know" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case form scientists know = allotrope.
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 ALLOTROPE mean?

ALLOTROPE noun
  1. Any form of an element that has a distinctly different molecular structure to another form of the same element.

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