US thinker who espoused simple living in his 1854 work Walden (7)

I believe the answer is:

thoreau

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

I've seen this clue in The Times.

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