The most common and most likely answer to this crossword clue is the 9 letter word BLOCKADES
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Buddy explains!
The straight part
We know that "Stops" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stops = blockades.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 BLOCKADES mean?
BLOCKADES noun- The physical blocking or surrounding of a place, especially a port, in order to prevent commerce and traffic in or out.
- (by extension) Any form of formal isolation of something, especially with the force of law or arms.
- The ships or other forces used to effect a naval blockade.
- Preventing an opponent's pawn moving by placing a piece in front of it
- To create a blockade against.