Set a limit on ale drunk in Northern Territory? (4,1,4)

I believe the answer is:

draw a line

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'set' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?

'a limit on ale drunk in northern territory?' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'in' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Irish Times.

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