Clip of Grace playing a song by one of The Killers on the airwaves
I believe the answer is:
poison gas
'one of the killers on the airwaves' is the definition.
I can't judge whether this definition defines the answer.
'clip of grace playing a song' is the wordplay.
'clip of grace' becomes 'pois' (I am not sure about this - if you are sure you should believe this answer much more).
'playing' indicates anagramming the letters.
'a'+'song'='asong'
'asong' with letters rearranged gives 'ongas'.
'pois'+'ongas'='POISON-GAS'
'by' acts as a link.
Can you help me to learn more?
(Other definitions for poison gas that I've seen before include "Eg, sarin or phosgene" , "Such as chlorine" .)