How far can you walk into a wood? (4,3)

I believe the answer is:

half way

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'how' is the definition.
Both the answer and definition are adverbs. Maybe there's an association between them I don't understand?

I don't understand the rest of the clue.

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(Another definition for half way that I've seen is " Where those who compromise should meet".)

I've seen this clue in the Evening Standard.

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