Go ahead and commit crime (5)
I believe the answer is:
forge
'go' is the definition.
(forging is a kind of going)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for forge that I've seen before include "Fabricate" , "Blacksmith's premises" , "Create by hammering" , "Counterfeit - smithy" , "Shape by heating and hammering, as smith does" .)