Smithy sight (5)
I believe the answer is:
anvil
'smithy sight' 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 for hammering" , "Forging block" , "Verdi chorus from Il Trovatore" , "Iron block; incus" , "Heavy block on which to hammer metal" .)