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Clap Paul's opera found unexpectedly (5,2,8)

Ross

I believe the answer is:

round of applause

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'clap' is the definition.
(thesaurus)

'paul's opera found unexpectedly' is the wordplay.
I cannot really see how this works, but
an anagram of 'found' is 'undof' which is within the answer.
an anagram of 'paul' is 'plau' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in The Daily Express.
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