The most common and most likely answer to this crossword clue is the 6 letter word SABRES
I've seen this crossword clue in The Guardian
S
A
B
R
E
S
Buddy explains!

The straight part
We know that "sharp weapons /sharp weapons" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sharp weapons /sharp weapons = sabres.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 SABRES mean?
SABRES noun- A light sword, sharp along the front edge, part of the back edge, and at the point.
- A modern fencing sword modeled after the sabre.