One is 'Mr Opera', possibly (10)

I believe the answer is:

impresario

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'one is mr opera possibly' is the definition.
I can't tell whether this definition defines the answer.

'one is mr opera possibly' is the wordplay.
'one' becomes 'i' (Roman numeral).
'possibly' indicates anagramming the letters.
'is'+'mr'+'opera'='ismropera'
'ismropera' is an anagram of 'mpresario'.
'i'+'mpresario'='IMPRESARIO'

Can you help me to learn more?

(Other definitions for impresario that I've seen before include "Theatrical organiser" , "Entertainer" , "Promoter of public entertainments" , "Sponsor and manager of public entertainments" , "Entertainment manager" .)

I've seen this clue in The Independent.

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