Where local workers are detained (6,4)
I believe the answer is:
behind bars
This clue is a double definition.
'where local workers are' is the first definition.
(staff in a pub or 'local' work behind the bar)
'detained' is the second definition.
(behind bars means imprisoned)
(Other definitions for behind bars that I've seen before include "Doing porridge" , "Where alcohol is kept" , "inside" , "Responsible for some music" , "In prison" .)