Samurai sword found in trunk at an armoury (6)

I believe the answer is:

katana

'samurai sword' is the definition.
(I've seen this in another clue)

'in trunk at an armoury' is the wordplay.
'in' indicates the answer is hidden within the clue.
'KATANA' is hidden within 'trunk at an armoury'.

'found' acts as a link.

I've seen this clue in The Guardian.

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