Stay in Berlin, Germany (6)
I believe the answer is:
linger
'stay' is the definition.
(lingering is a kind of staying)
'in berlin germany' is the wordplay.
'in' indicates a hidden word.
'LINGER' can be found hidden inside 'berlin germany'.
(Other definitions for linger that I've seen before include "Stay behind" , "Remain for long" , "Hang about, don't be in a hurry to go" , "Remain behind" , "Dawdle, hang around" .)