Cryptic crossword clue
Yet Helen synthesised gas 8

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

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Buddy explains!

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

ETHYLENE noun
  1. The common name for the organic chemical compound ethene. The simplest alkene, a colorless gaseous (at room temperature and pressure) hydrocarbon with the chemical formula C2H4.
  2. The divalent radical derived from ethane.

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