Ramble is unpleasant to the German (7)
I believe the answer is:
meander
'ramble' is the definition.
(I know that ramble can be written as meander)
'unpleasant to the german' is the wordplay.
'unpleasant' becomes 'mean' ().
'to the german' becomes 'der' ('the' in German).
'mean'+'der'='MEANDER'
'is' is the link.
(Other definitions for meander that I've seen before include "Wander idly" , "Renamed (anag)" , "Dear men (anag) - wander" , "Take a winding course" , "Roam aimlessly around" .)