The most common and most likely answer to this crossword clue is the 8 letter word DOWNWIND
I've seen this crossword clue in Independent
D
O
W
N
W
I
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D
More clues leading to the result DOWNWIND
Buddy explains!
The straight part
We know that "where gas flows" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case where gas flows = downwind.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 DOWNWIND mean?
DOWNWIND adverb- In the same direction as the wind is blowing
- (+ from) positioned relative to something in such a way that it can be smelled in the wind
- In the direction opposite that of landing in a traffic pattern