Forger's workshop? (6)
I believe the answer is:
smithy
'forger's workshop?' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for smithy that I've seen before include "Blacksmith's workplace" , "work area" , "Where 3s were made and fitted" , "Forger's workshop" , "Workplace for forging metal" .)