The most common and most likely answer to this crossword clue is the 5 letter word XENON
I've seen this crossword clue in The Guardian
X
E
N
O
N
More clues leading to the result XENON
- Gas on under beef, lid off
- Finally, burn energy by turning on gas
- Gas in canon exploded backwards
- Buddhist school said have working gas
- no. 54 in the table
- 10 Bit of atmosphere created by Times – nothing in Mirror
- Part of oven on, extra switches for gas
- Gas on in future, cut back
- Periodically, 54 times nothing mounts up
- Nobody comes back after 10:25?
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 = xenon.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 XENON mean?
XENON noun- The chemical element (symbol Xe) with an atomic number of 54. It is a colorless, odorless, unreactive noble gas, used notably in camera flash technology.