The most common and most likely answer to this crossword clue is the 8 letter word ASSAGAIS
I've seen this crossword clue in The Daily Telegraph
A
S
S
A
G
A
I
S
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 = assagais.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 ASSAGAIS mean?
ASSAGAIS noun- A slim hardwood spear or javelin with an iron tip, especially those used by Bantu peoples of Southern Africa.
- The tree species Curtisia dentata, the wood of which is traditionally used to make assegais.
- To spear with an assegai.