US author for one visits bogus healer (6,3)

I believe the answer is:

harper lee

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'us author' is the definition.
(author of To Kill a Mockingbird)

I don't understand how the remainder of the clue works.

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(Other definitions for harper lee that I've seen before include "Author of Go Set a Watchman, d. 2016 -- paler here (anag)" , "American novelist" .)

I've seen this clue in The Independent.

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