Dated and wrong to be going round alone (8)
I believe the answer is:
obsolete
'dated' is the definition.
(thesaurus)
'wrong to be going round alone' is the wordplay.
'wrong' indicates an anagram.
'going round' indicates putting letters inside.
'alone' becomes 'sole' ('sole' can be a synonym of 'alone').
'to'+'be'='tobe'
'tobe' anagrammed gives 'obte'.
'obte' placed around 'sole' is 'OBSOLETE'.
'and' is the link.
(Other definitions for obsolete that I've seen before include "No longer current" , "being out of practice" , "Outdated" , "Old hat" , "Disused" .)