Nonconformist causing upset to residents (9)
I believe the answer is:
dissenter
'nonconformist' is the definition.
(a nonconformist dissents from convention)
'upset to residents' is the wordplay.
'upset' indicates anagramming the letters.
'residents' anagrammed gives 'DISSENTER'.
'causing' is the link.
(Other definitions for dissenter that I've seen before include "one not C of E" , "One who objects" , "One expressing disagreement" , "One who disagrees out of tiredness" , "A non-orthodox" .)