Is rude to new immigrant (8)
I believe the answer is:
outsider
'immigrant' is the definition.
(thesaurus)
'is rude to new' is the wordplay.
'new' is an anagram indicator.
'is'+'rude'+'to'='isrudeto'
'isrudeto' anagrammed gives 'OUTSIDER'.
(Other definitions for outsider that I've seen before include "One not in a particular group" , "Not a member of the group" , "Unfancied competitor" , "One not fancied to win" , "Not one of the in-crowd" .)