It means trouble for residents (7)
I believe the answer is:
inmates
'for residents' is the definition.
(inmate is a kind of resident)
'it means trouble' is the wordplay.
'trouble' indicates anagramming the letters.
'it'+'means'='itmeans'
'itmeans' anagrammed gives 'INMATES'.
(Other definitions for inmates that I've seen before include "Ties man (anag.)" , "Inhabitants" , "Prisoners" .)