District court supporting troubled prince (8)
I believe the answer is:
precinct
'district' is the definition.
(I know that precinct is a type of city district)
'court supporting troubled prince' is the wordplay.
'court' becomes 'ct' (abbreviation used in road names).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'troubled' indicates an anagram.
'prince' is an anagram of 'precin'.
'ct' after 'precin' is 'PRECINCT'.
(Other definitions for precinct that I've seen before include "Enclosed space around, eg, a cathedral" , "Shopping centre" , "Area around a cathedral or church" , "Designated area of US police" , "Area of US city" .)