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Cats' worry about a musical dance (8)

Ross

I believe the answer is:

hairball

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'cats' worry' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'a musical dance' is the wordplay.
'a musical' becomes 'hair' (1960s musical).
'dance' becomes 'ball' (ball is a kind of dance).
'hair'+'ball'='HAIRBALL'

'about' is the link.

Can you help me to learn more?

(Other definitions for hairball that I've seen before include "in the middle of Cats?" , "Bundle of fur coughed up by cat" , "Reason for cat cough?" , "Furry mass forming in cat's stomach" , "Uncomfortable thing in a cat's stomach?" .)

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