The most common and most likely answer to this crossword clue is the 10 letter word SMOKESTACK
I've seen this crossword clue in The Guardian
S
M
O
K
E
S
T
A
C
K
More clues leading to the result SMOKESTACK
Buddy explains!
The straight part
We know that "source of industrial pollution" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of industrial pollution = smokestack.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 SMOKESTACK mean?
SMOKESTACK noun- A conduit or group of conduits atop a structure allowing smoke to flow out.