It means trouble for residents (7)
I believe the answer is:
inmates
'residents' is the definition.
(inmate is a kind of resident)
'it means trouble' is the wordplay.
'trouble' is an anagram indicator.
'it'+'means'='itmeans'
'itmeans' is an anagram of 'INMATES'.
'for' acts as a link.
(Other definitions for inmates that I've seen before include "Ties man (anag.)" , "Inhabitants" , "Prisoners" .)