Accountant shares case with artist but her warnings are dismissed (9)

I believe the answer is:

cassandra

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'her warnings are dismissed' is the definition.
I can't tell whether this definition defines the answer.

'accountant shares case with artist' is the wordplay.
'accountant' becomes 'CA' (abbreviation for chartered accountant).
'case' says to hollow out the word (remove centre letters).
'with' becomes 'and'.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'shares' with its middle removed is 'ss'.
'ca'+'ss'+'and'+'ra'='CASSANDRA'

'but' is the link.

Can you help me to learn more?

(Other definitions for cassandra that I've seen before include "Unheeded prophetess" , "Prophesying daughter of Priam of Troy" , "Jane's sister" , "Person who prophecies disaster, after woman in Greek legend" , "forecaster" .)

I've seen this clue in The Irish Times.

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