Possibly hear out US writer (7)

I believe the answer is:

thoreau

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'us writer' is the definition.
'Thoreau' can be an answer for 'writer' (Thoreau is an example). I'm not certain of the 'us' bit.

'possibly hear out' is the wordplay.
'possibly' indicates an anagram.
'hear'+'out'='hearout'
'hearout' with letters rearranged gives 'THOREAU'.

Can you help me to learn more?

(Other definitions for thoreau that I've seen before include "American author, friend of Emerson" , "an American one" , "Henry David --, US essayist and poet" , "Henry -, US author; author 'e (anag.)" , "Philosopher (American)" .)

I've seen this clue in The Globe and Mail.

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