Cryptic crossword clue
Featured in Australian commonly, Syd Cohen’s regularly taken poison 10

The most common and most likely answer to this crossword clue is the 10 letter word STRYCHNINE

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

The straight part
We know that "poison" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case poison = strychnine.
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 STRYCHNINE mean?

STRYCHNINE noun
  1. A very toxic, colourless crystalline alkaloid, derived from nux vomica, used as a pesticide

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