German city tourist very quietly leaves (5)
I believe the answer is:
trier
'german city' is the definition.
(I've seen this before)
'tourist very quietly leaves' is the wordplay.
'tourist' becomes 'tripper' (tripper is a kind of tourist).
'very quietly' becomes 'pp' (musical abbreviation for pianissimo).
'leaves' suggests deleting specific letters.
'tripper' with 'pp' removed is 'TRIER'.
(Other definitions for trier that I've seen before include "One who refuses to give up -- German city on the Moselle" , "Person attempting" , "Judge perhaps" , "The Lord loves one, it's said" , "He's making an effort" .)