The last word on Germany's change for the better (5)
I believe the answer is:
amend
'change for the better' is the definition.
(I've seen this before)
'the last word on germany's' is the wordplay.
'the last word' becomes 'amen' (I've seen this before).
'on' means one lot of letters go next to another.
'germany' becomes 'd' (international vehicle registration code).
'amen'+'d'='AMEND'
(Other definitions for amend that I've seen before include "Make minor improvements to (something)" , "Alter in detail" , "Revise" , "Make corrections to (eg, document)" , "Make minor changes to" .)