The most common and most likely answer to this crossword clue is the 7 letter word PROPANE
P
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O
P
A
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E
More clues leading to the result PROPANE
- Flammable substance for glass
- Fuel sometimes supplied in bottles supporting sheet of glass?
- Fuel gas for energy under cooking vessel
- Item in production, article with neon gas
- Malodorous gas, for the window!
- Fuel for glass
- Gas for audible suffering
- Gas for energy brought across hollow in the ground
- Old man in flat producing gas
- Gaseous fuel, on paper, looking bad
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 = propane.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 PROPANE mean?
PROPANE noun- An aliphatic hydrocarbon, C3H8, a constituent of natural gas.