Letters rewritten for newcomer (7)
I believe the answer is:
settler
'for newcomer' is the definition.
(thesaurus)
'letters rewritten' is the wordplay.
'rewritten' indicates an anagram.
'letters' with letters rearranged gives 'SETTLER'.
(Other definitions for settler that I've seen before include "Coloniser - arbitrator" , "Colonist, pioneer" , "Person who moves into an uninhabited country" , "One colonising new area" , "decisive blow" .)