Tough neighbourhood banning detective inspector (6)
I believe the answer is:
strict
'tough' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for strict that I've seen before include "Tough" , "Hard" , "Uncompromising in discipline" , "Stringent" , "Demanding that rules are observed" .)