Search for a weapon (5)
I believe the answer is:
rifle
I believe this clue is a double definition.
'search' is the first definition.
(I know that rifle is a kind of search)
'for a weapon' is the second definition.
(rifle is a kind of weapon)
(Other definitions for rifle that I've seen before include "Strip - firearm" , "An arm" , "Search and rob for army weapon" , "Security provider with stock" , "Gun; plunder" .)