Turn upside down in a search (7)
I believe the answer is:
ransack
'turn upside down in a search' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ransack that I've seen before include "Search (a place) thoroughly" , "Search thoroughly and roughly" , "Rummage, rifle" , "Search thoroughly - pillage" , "Rob and despoil" .)