Set, as a security system (5)
I believe the answer is:
armed
(Other definitions for armed that I've seen before include "Being equipped with 25 Across" , "ready to fight" , "Carrying a gun" , "Supplied with weapons" , "Tooled up" .)
I believe the answer is:
armed
(Other definitions for armed that I've seen before include "Being equipped with 25 Across" , "ready to fight" , "Carrying a gun" , "Supplied with weapons" , "Tooled up" .)