A regular at the Met, perhaps, in poorer age, unfortunately (5-4)

I believe the answer is:

opera-goer

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'a regular at the met perhaps' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'poorer age unfortunately' is the wordplay.
'unfortunately' indicates an anagram (a bad or unfortunate spelling).
'poorer'+'age'='poorerage'
'poorerage' anagrammed gives 'OPERA-GOER'.

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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