Blacksmith's block (5)
I believe the answer is:
anvil
'blacksmith's block' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for anvil that I've seen before include "Block on which metals are hammered" , "Block for metalworking" , "On which hot metal is shaped" , "It helps forger" , "part of the ear" .)