Crossword Genius

Disorderly state of consecutive sets of numbers (5,3,6)

Ross

I believe the answer is:

sixes and sevens

I'm a little stuck... Click here to teach me more about this clue!

'disorderly' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.

'state of consecutive sets of numbers' is the wordplay.
I cannot really understand how this works, but
'state' could be 'nd' (abbreviation for North Dakota) and 'nd' is found within the answer.
'numbers' could be 'sevens' (seven is a kind of number) and 'sevens' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

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