Ransack and rob (5)
I believe the answer is:
rifle
'ransack and rob' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rifle that I've seen before include "loot in sack" , "Pillage; a weapon" , "Search and rob - with long gun?" , "lock, stock and barrel" , "Search with intent to steal" .)