Periodical (8)

I think it could be either:

Which length description are you looking for?:

magazine

'periodical' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for magazine that I've seen before include "Periodical in arms depot" , "Arsenal" , "Storehouse for weapons" , "Periodical - weapon store" , "Slug container" .)

I've seen this clue in The Guardian and the Evening Standard.

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