Henry David —, US author of 1849 essay Civil Disobedience (7)

I believe the answer is:

thoreau

(Other definitions for thoreau that I've seen before include "Henry David -, US author (Walden)" , "American writer" , "French writer" , "Henry David --, US essayist and poet" , "One who wrote" .)

I've seen this clue in The Mirror.

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