Is terrible broadcast about lives fascinating? (12)
I believe the answer is:
irresistible
'fascinating?' is the definition.
(thesaurus)
'is terrible broadcast about lives' is the wordplay.
'broadcast' indicates anagramming the letters (letters scattered or cast around).
'about' means one lot of letters goes inside another.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'is'+'terrible'='isterrible'
'isterrible' anagrammed gives 'irrestible'.
'irrestible' enclosing 'is' is 'IRRESISTIBLE'.
(Other definitions for irresistible that I've seen before include "Too tempting to be resisted" , "Overpowering" , "Very seductive" .)