Sourcing bad muck to be broadcast in a lift? (10,5)

I believe the answer is:

background music

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'a lift?' is the definition.
Both the definition and answer are singular nouns.
Maybe there's an association between them I don't understand?

'sourcing bad muck to be broadcast' is the wordplay.
'to be broadcast' indicates an anagram.
'sourcing'+'bad'+'muck'='sourcingbadmuck'
'sourcingbadmuck' with letters rearranged gives 'BACKGROUND MUSIC'.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for background music that I've seen before include "atmospheric enhancement" , "Muzak" .)

I've seen this clue in The Telegraph.

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