Useless person (8)

I believe the answer is:

deadwood

(Other definitions for deadwood that I've seen before include "Useless person, a burden like extinct timber" , "Someone or thing unwanted and unneeded" , "Useless material" , "Material not any good" , "Useless encumbrance - Calamity Jane's stage" .)

I've seen this clue in The Mirror.

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