Tourist double parking in German city (7)
I believe the answer is:
tripper
'tourist' is the definition.
(I know that tripper is a type of tourist)
'double parking in german city' is the wordplay.
'double' shows that letters should be duplicated.
'parking' becomes 'p' (abbreviation on road signs).
'in' indicates putting letters inside.
'german city' becomes 'trier' (Trier is a city in Germany).
'p' duplicated is 'pp'.
'pp' going inside 'trier' is 'TRIPPER'.
(Other definitions for tripper that I've seen before include "Person on an excursion" , "One who makes an excursion" , "Holidaymaker" , "Motorist just for fun" , "Person on pleasure day out - sounds unstable" .)