Ruin, destroy (5)
I believe the answer is:
wreck
I believe this is a double definition.
'ruin' is the first definition.
(I know that wreck is a more specific form of ruin)
'destroy' is the second definition.
(I know that wreck is a more specific form of destroy)
(Other definitions for wreck that I've seen before include "Demolish; sunken ship" , "A destroyed ship" , "Destroy, ruin" , "Smash" , "Devastate" .)