Germany perversely agreed to devalue (7)
I believe the answer is:
degrade
'devalue' is the definition.
(thesaurus)
'germany perversely agreed' is the wordplay.
'germany' becomes 'd' (international vehicle registration code).
'perversely' indicates anagramming the letters.
'agreed' with letters rearranged gives 'egrade'.
'd'+'egrade'='DEGRADE'
'to' is the link.
(Other definitions for degrade that I've seen before include "Humiliate" , "Disgrace, lower in status" , "Put down" , "Deprive of dignity" , "Decompose chemically" .)