Crossword Genius

Somehow a song slid off sliding scale (9)

Ross

I believe the answer is:

glissando

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'off sliding scale' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'somehow a song slid' is the wordplay.
'somehow' indicates anagramming the letters.
'a'+'song'+'slid'='asongslid'
'asongslid' anagrammed gives 'GLISSANDO'.

Can you help me to learn more?

(Other definitions for glissando that I've seen before include "trombone slide, for example" , "Slide between two notes" , "Sliding series of notes (mus.)" , "Musical flourish" , "Re-interpreting this musical direction" .)

I've seen this clue in the Sydney Morning Herald.
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