Dip inside Opera Italia (5)

I believe the answer is:

raita

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'dip' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'inside opera italia' is the wordplay.
'inside' indicates the answer is hidden within the clue.
'RAITA' is hidden in the letters of 'opera italia'.

Can you help me to learn more?

(Other definitions for raita that I've seen before include "Yoghurt-based Indian condiment" , "Curry cooler" , "Cucumber and mint Indian dip" , "accompaniment to curry" , "Indian yogurt dip" .)

I've seen this clue in The Times.

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