The most common and most likely answer to this crossword clue is the 9 letter word STOVEPIPE
S
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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 STOVEPIPE mean?
STOVEPIPE noun- Sheet-metal tubing used as a chimney for a stove or furnace.
- A channel for information which is compartmentalized in such a manner that some parties who might be interested in its use or be able to utilize it are restricted from accessing it.
- To collect or store (information) in a compartmentalized manner, so that some parties who might be interested in its use or be able to utilize it are restricted from accessing it.