Worried at a slur from the South (7)
I believe the answer is:
austral
'the south' is the definition.
(thesaurus)
'worried at a slur' is the wordplay.
'worried' is an anagram indicator.
'at'+'a'+'slur'='ataslur'
'ataslur' anagrammed gives 'AUSTRAL'.
'from' acts as a link.
(Other definitions for austral that I've seen before include "Southern - rat Saul (anag)" , "Of the southern hemisphere" , "coming from Perth?" .)