The most common and most likely answer to this crossword clue is the 9 letter word ARTILLERY
I've seen this crossword clue in The Guardian
A
R
T
I
L
L
E
R
Y
More clues leading to the result ARTILLERY
- Big guns, hostile placed in middle of major road
- Big guns badly interrupting main traffic route
- Powerful weaponry, ominous positioned in middle of major road
- Affliction blocking blood vessel in arms
- Important transport link cut by hostile heavy guns
- Guns poorly sited in channel
- Big guns badly stuck in main road
- Vessel carrying poorly soldiers
- Holding line, it rarely disturbed gunners
- A railway brings in one cultivating the big guns?
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 = artillery.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 ARTILLERY mean?
ARTILLERY noun- Large cannon-like weapons, transportable and usually operated by more than one person.
- An army unit that uses such weapons.
- Gunnery.
- A military formation using projectile weapons, such as archers.