Cryptic crossword clue
Four-line whips, highly toxic stuff 8

The most common and most likely answer to this crossword clue is the 8 letter word FLUORINE

I've seen this crossword clue in Financial Times
F
L
U
O
R
I
N
E

Buddy explains!

The straight part
We know that "highly toxic stuff" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case highly toxic stuff = fluorine.
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 FLUORINE mean?

FLUORINE noun
  1. The chemical element (symbol F) with an atomic number of 9. It is the lightest of the halogens, a pale yellow-green, highly reactive gas that attacks all metals.
  2. A single atom of this element.

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