Entertainment no good during an emergency broadcast! (5)
I believe the answer is:
songs
'entertainment no good during an emergency broadcast' is the definition.
I can't judge whether this defines the answer.
'no good during an emergency broadcast' is the wordplay.
'no good' becomes 'ng' (abbreviation).
'during' means one lot of letters goes inside another.
'an emergency broadcast' becomes 'sos' (I've seen this in another clue).
'ng' inserted within 'sos' is 'SONGS'.
Can you help me to learn more?
(Other definitions for songs that I've seen before include "Melodies with words" , "Airs" , "Ditties" , "Being 16 [SINGERS] , they would produce these" , "hymns" .)