They could be sung in a sari (5)

I believe the answer is:

arias

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'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps they are linked in a way I don't understand?

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

'could' is the link.

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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