District about to be encapsulated by policeman in Court (8)
I believe the answer is:
precinct
'district' is the definition.
(precinct is a kind of district)
'about to be encapsulated by policeman in court' is the wordplay.
'about' becomes 're' (regarding**).
'to be encapsulated by' means one lot of letters goes inside another (I've seen this in other clues).
'policeman' becomes 'pc'.
'court' becomes 'ct'.
're' inserted inside 'pc' is 'prec'.
'prec'+'in'+'ct'='PRECINCT'
(Other definitions for precinct that I've seen before include "District of a city or town marked out for a particular purpose" , "American police division" , "Area around a cathedral or church" , "Area of US city" , "Shopping centre" .)