Destruction, slaughter (7)
I believe the answer is:
carnage
I believe this clue is a double definition.
'destruction' is the first definition.
(I've seen this before)
'slaughter' is the second definition.
(I know that slaughter can be written as carnage)
(Other definitions for carnage that I've seen before include "Indiscriminate slaughter" , "'Massacre, slaughter (7)'" , "Mayhem" , "The killing of many people, slaughter" , "Bloodshed" .)