Crossword Genius

Vocalist to improvise around unusual chord - it's a must-see (12,3)

Ross

I believe the answer is:

schrodingers cat

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'a must-see' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'vocalist to improvise around unusual chord' is the wordplay.
'vocalist' becomes 'singer' (synonyms).
'to improvise' becomes 'scat' (I can't explain this - if you can you should believe this answer much more).
'around' means one lot of letters goes inside another.
'unusual' indicates an anagram.
'singer'+'scat'='singerscat'
'chord' anagrammed gives 'chrod'.
'singerscat' placed around 'chrod' is 'SCHRODINGERS CAT'.

'it's' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.
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