Bone of the ear (5)

I think it could be either:

Which length description are you looking for?:

anvil

(Other definitions for anvil that I've seen before include "Heavy metal block in forge" , "Verdi chorus from Il Trovatore" , "Smithy's block" , "On which hot metal is shaped" , "Forge equipment" .)

I've seen this clue in The Times.

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