Failure, for example, of NBC broadcast with astronaut (8,4)
I believe the answer is:
abstract noun
'failure for example' is the definition.
(failure is an abstract noun)
'nbc broadcast with astronaut' is the wordplay.
'broadcast with' indicates an anagram (letters scattered or cast around).
'nbc' anagrammed with 'astronaut' gives 'ABSTRACT NOUN'.
'of' acts as a link.
(Other definitions for abstract noun that I've seen before include "carelessness perhaps" , "Substantive referring to non-physical thing" .)