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 backwards within the letters.
But, I'm uncertain how the hidden word 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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