Cryptic crossword clue
Ludicrous to replace gas with another substance 8

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

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

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

CHEMICAL noun
  1. Any specific chemical element or chemical compound or alloy.
  2. An artificial chemical compound.
  3. An addictive drug.
CHEMICAL adjective
  1. Of or relating to chemistry.
  2. Of or relating to a material or processes not commonly found in nature or in a particular product.
  3. Of or relating to alchemy.

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