In opera, maybe, he turned up in a coronet (5)

I believe the answer is:

tenor

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'in opera maybe he turned up' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'a coronet' is the wordplay.
'TENOR' is hidden back-to-front within the letters.
But, I'm not sure how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for tenor that I've seen before include "Voice of Tamino" , "General course - male singer" , "Male 17" , "Pavarotti, maybe" , "Eg, Luciano Pavarotti" .)

I've seen this clue in the Evening Standard.

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