Neighbouring cast end act without approval from Berlin (8)
I believe the answer is:
adjacent
'neighbouring' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for adjacent that I've seen before include "cheek by jowl" , "Contiguous" , "Neighbouring" , "Next-door" , "Lying near or next (to)" .)