Goody-goody in up-train, unsettled (7)
I believe the answer is:
puritan
'goody-goody' is the definition.
(thesaurus)
'up-train unsettled' is the wordplay.
'unsettled' indicates an anagram.
'up'+'train'='uptrain'
'uptrain' is an anagram of 'PURITAN'.
'in' is the link.
(Other definitions for puritan that I've seen before include "Strict person for whom pleasure is sinful" , "Person of extreme moral strictness" , "very proper person?" , "Dour Protestant" , "Strait-laced" .)