Devastate German for good (3)
I believe the answer is:
gut
I believe this clue is a double definition.
'devastate' is the first definition.
(thesaurus)
'german for good' is the second definition.
('good' in German)
(Other definitions for gut that I've seen before include "Internal channel" , "Part of intestine" , "Remove innards from" , "strong feelings" , "restricted passage" .)