Football club magazine (7)
I believe the answer is:
arsenal
This clue is a double definition.
'football club' is the first definition.
(Arsenal football club)
'magazine' is the second definition.
(both can mean an ammunition store)
(Other definitions for arsenal that I've seen before include "Collection of weapons" , "favoured by some football supporters" , "Supply of weapons" , "Mil. magazine; FA club" , "Football club based at Emirates Stadium" .)