Being collected from class, men misbehaving (8)

I believe the answer is:

calmness

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'being collected from' is the definition.
I can't tell whether this definition defines the answer.

'class men misbehaving' is the wordplay.
'misbehaving' indicates an anagram.
'class'+'men'='classmen'
'classmen' with letters rearranged gives 'CALMNESS'.

Can you help me to learn more?

(Other definitions for calmness that I've seen before include "Composure, equanimity" , "Serenity" .)

I've seen this clue in The Times.

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