German city judge (5)
I believe the answer is:
trier
I believe this clue is a double definition.
'german city' is the first definition.
(Trier is a city in Germany)
'judge?' is the second definition.
(a judge tries a case in court)
(Other definitions for trier that I've seen before include "One has a crack" , "European city" , "One who makes an effort" , "Judge perhaps" , "One who doesn't give up - judge?" .)