Reduced collection of notes after second contribution to TV drama? (10,5)

I believe the answer is:

background music

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'contribution to tv drama?' is the definition.
(music played in the background of a TV show)

I cannot understand how the remainder of the clue works.

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

I've seen this clue in The Times.

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