Chew steadily, touring one German city (6)
I believe the answer is:
munich
'german city' is the definition.
(city in Germany)
'chew steadily touring one' is the wordplay.
'chew steadily' becomes 'munch' (to munch is to chew on food).
'touring' means one lot of letters goes inside another (touring can mean going round).
'one' becomes 'i' (Roman numeral).
'munch' enclosing 'i' is 'MUNICH'.
(Other definitions for munich that I've seen before include "German capital" , "South German city" , "Bavarian capital" , "Site of 1972 Olympics" , "Chum in Germany" .)