Forge sights (6)

I believe the answer is:

anvils

(Other definitions for anvils that I've seen before include "Iron blocks for hammering hot metal" , "Heavy blocks for blacksmiths" , "Iron blocks for blacksmiths" , "Blocks for a blacksmith to work on" , "Heavy blocks for the blacksmith" .)

I've seen this clue in the King Feature Syndicate.

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