We let a building well to the north (6)

I believe the answer is:

atweel

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'north' is the definition.
Both the answer and definition are adverbs.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

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(Another definition for atweel that I've seen is " Scot. Indeed?".)

I've seen this clue in The Times and The Sunday Times.

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