Fakes tools for the blacksmith (6)

I believe the answer is:

forges

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'fakes' is the definition.
(I know this)

I don't understand how the rest of the clue works.

(Other definitions for forges that I've seen before include "Counterfeits, signature or banknotes" , "Workplaces of smithies" , "Shapes with fire and hammer" , "'Fakes, a signature say (6)'" , "Works with iron or counterfeits money" .)

I've seen this clue in the Sydney Morning Herald.

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