The most common and most likely answer to this crossword clue is the 9 letter word CUTLASSES
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More clues leading to the result CUTLASSES
Buddy explains!

The straight part
We know that "weapons" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case weapons = cutlasses.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 CUTLASSES mean?
CUTLASSES noun- A short sword with a curved blade, and a convex edge; once used by sailors when boarding an enemy ship.
- A similarly shaped tool; a machete.