Plunder or pillage (7)
I believe the answer is:
ransack
I believe this clue is a double definition.
'plunder' is the first definition.
(synonyms)
'pillage' is the second definition.
(synonyms)
(Other definitions for ransack that I've seen before include "Search, leaving no stone unturned" , "Loot or search thoroughly" , "Plunder - rummage" , "Search thoroughly - pillage" , "Pillage, loot" .)