The morning’s started badly for him (4)

I believe the answer is:

norm

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'the morning's started badly for him' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

This is all the clue.

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(Other definitions for norm that I've seen before include "Most frequent state" , "Usual or standard thing" , "Bacterium, virus, etc" , "Benchmark" , "Accepted standard of behaviour" .)

I've seen this clue in the Evening Standard.

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