Smith's property in the block (5)

I believe the answer is:

anvil

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'the block' is the definition.
(anvil is a kind of block)

I cannot understand how the remainder of the clue works.

(Other definitions for anvil that I've seen before include "Block on which metal can be hammered" , "Block for blacksmith" , "One frequently gets hammered" , "Forging equipment" , "Block in smithy" .)

I've seen this clue in the Evening Standard.

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