Callas won't start her song? (4)

I believe the answer is:

aria

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'song?' is the definition.
(I know that aria is a type of song)

'callas won't start' is the wordplay.
'callas' becomes 'maria' (Maria Callas).
'won't start' means to remove the first letter.
'maria' with its first letter taken off is 'ARIA'.

'her' is the link.
This may not be right. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for aria that I've seen before include "part of opera, maybe" , "Repeated strain" , "Vocal solo in a cantata etc" , "Operatic number" , "Operatic air" .)

I've seen this clue in The Sun.

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