Arsenal weekly? (8)
I believe the answer is:
magazine
I believe this clue is a double definition.
'arsenal' is the first definition.
(I've seen this before)
'weekly?' is the second definition.
(thesaurus)
(Other definitions for magazine that I've seen before include "Weapons' store" , "Read it or keep munitions in it" , "Glossy publication?" , "Arms store or periodic publication" , "Journal, periodical" .)