Cryptic crossword clue
Samurai sword found in trunk at an armoury 6

The most common and most likely answer to this crossword clue is the 6 letter word KATANA

I've seen this crossword clue in The Guardian
K
A
T
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Buddy explains!

The straight part
We know that "Samurai sword" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case samurai sword = katana.
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 KATANA mean?

KATANA noun
  1. A type of Japanese longsword or 日本刀, having a single edge and slight curvature, historically used by samurai and ninja.

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