Exceptionally, monsieur abandons minor row at cathedral city (12)

I believe the answer is:

inordinately

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'exceptionally' is the definition.
Both the definition and answer are adverbs. Maybe there's a link between them I don't understand?

'monsieur abandons minor row at cathedral city' is the wordplay.
'monsieur' becomes 'm' (French abbreviation - like Mr for Mister).
'abandons' is a deletion indicator.
'row' becomes 'din' (both can mean a loud disturbance).
'cathedral city' becomes 'Ely' (English city with a cathedral).
'minor' with 'm' taken away is 'inor'.
'inor'+'din'+'at'+'ely'='INORDINATELY'

Can you help me to learn more?

(Another definition for inordinately that I've seen is " Excessively".)

I've seen this clue in The Times.

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