Terrible crooner died, it's official (2,6)
I believe the answer is:
on record
'official' is the definition.
(thesaurus)
'terrible crooner died' is the wordplay.
'terrible' indicates an anagram.
'died' becomes 'd'.
'crooner' with letters rearranged gives 'onrecor'.
'onrecor'+'d'='ON RECORD'
'it's' is the link.
(Other definitions for on record that I've seen before include "Officially recognised" , "Publicly known - stated in published document" , "officially acknowledged" , "where needles used to be put" , "Officially noted" .)