Now Arsenal has battles (4)
I believe the answer is:
wars
'battles' is the definition.
(I know this)
'now arsenal has' is the wordplay.
'has' indicates a hidden word.
'WARS' can be found hidden inside 'now arsenal'.
(Other definitions for wars that I've seen before include "Battles" , "- - of the Roses" , "See 8" , "Armed conflicts against enemies" .)