Go ahead and commit a crime (5)

I believe the answer is:

forge

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'go' is the definition.
(forging is a kind of going)

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

(Other definitions for forge that I've seen before include "Form by heating and hammering" , "Smith's workplace" , "Ironworks" , "1 across" , "Furnace for heating metal" .)

I've seen this clue in the Evening Standard.

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