Crossword Genius

Declining music for a song (7)

Ross

I believe the answer is:

setting

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'declining' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for setting that I've seen before include "Mount for gem" , "Where one may find Ruby" , "Musical version of song" , "Environment" , "Writing puzzles, perhaps" .)

I've seen this clue in The Globe and Mail.
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