Search for weapon (5)
I believe the answer is:
rifle
This clue is a double definition.
'search' is the first definition.
(as in rifling around for something)
'for weapon' is the second definition.
(rifle is a kind of weapon)
(Other definitions for rifle that I've seen before include "Carbine" , "An arm" , "Gun - steal" , "Ransack; a weapon" , "Firearm - plunder" .)