If quartet chosen to play on the radio, piece after the news? (7,8)

I believe the answer is:
weather forecast
'the news?' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'if quartet chosen to play on the radio piece' is the wordplay.
I cannot really see how this works, but
'to' could be 'for' and 'for' is present in the answer.
'play' could be 'cast' (cast is a kind of play) and 'cast' is found in the answer.
'on' could be 'at' (I've seen this in other clues) and 'at' is found within the answer.
'piece' could be 'r' (abbreviation for Rook) and 'r' is found within the answer.
This explanation may well be incorrect...
'after' is the link.
Can you help me to learn more?
(Other definitions for weather forecast that I've seen before include "prediction" , "Met objective" , "item after news" , "Predicton" .)
