Can be sung in a sari (5)

I believe the answer is:

arias

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'can be sung' is the definition.
I can't judge whether this definition defines the answer.

'a sari' is the wordplay.
'a sari' can be anagrammed to 'ARIAS'.
However, I am unsure how this is indicated.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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