Fellow internally reconfigured giant workshop (5)

I believe the answer is:

forge

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'workshop' is the definition.
(I know that forge is a type of workshop)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for forge that I've seen before include "Furnace for heating metal" , "Blacksmith's workshop" , "Fabricate" , "Create; counterfeit" , "Smith's workplace" .)

I've seen this clue in The Independent.

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