New husband coming off heroin? Such language! (5)
I believe the answer is:
norse
'language' is the definition.
(Norse is an example)
'new husband coming off heroin?' is the wordplay.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'husband' becomes 'h'.
'coming off' indicates named letters should be taken away.
'heroin?' becomes 'horse' (slang term for heroin).
'horse' with 'h' taken away is 'orse'.
'n'+'orse'='NORSE'
'such' is the link.
(Other definitions for norse that I've seen before include "Old European" , "Relating to ancient Scandinavia" , "Language - senor! (anag)" , "Native to Scandinavia" , "Snore (anag)" .)