Cryptic crossword clue
A big mistake for vehicles to carry small outdated arms 13

The most common and most likely answer to this crossword clue is the 13 letter word BLUNDERBUSSES

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Buddy explains!

The straight part
We know that "outdated arms" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outdated arms = blunderbusses.
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 BLUNDERBUSSES mean?

BLUNDERBUSSES noun
  1. An old style of muzzleloading firearm and early form of shotgun with a distinctive short, large caliber barrel that is flared at the muzzle, therefore able to fire scattered quantities of nails, stones, shot, etc. at short range.

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