Ali, get Lily sorted out; it’s an infringement (10)

I believe the answer is:

illegality

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'an infringement' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'ali get lily sorted out' is the wordplay.
'sorted out' is an anagram indicator.
'ali'+'get'+'lily'='aligetlily'
'aligetlily' anagrammed gives 'ILLEGALITY'.

'it's' is the link.

Can you help me to learn more?

(Another definition for illegality that I've seen is " law-breaking".)

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

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