Crossword Genius

We lay off crook over one set of behaviours (3,2,4)

Ross

I believe the answer is:

way of life

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'set of behaviours' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for way of life that I've seen is " Style of existence".)

I've seen this clue in the Sydney Morning Herald.
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