Search and rob of a weapon (5)
I believe the answer is:
rifle
I believe this clue is a double definition.
'search and rob' is the first definition.
(I've seen this in another clue)
'weapon' is the second definition.
(rifle is a kind of weapon)
'of a' is the link.
(Other definitions for rifle that I've seen before include "Ransack; a weapon" , "disarray" , "Weapon - sack" , "Gun; thoroughly search" , "loot in sack" .)