Go-ahead criminal? (6)
I believe the answer is:
forger
'go-ahead criminal?' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'go-ahead criminal?' is the wordplay.
'go' becomes 'forge' (forging is a kind of going).
'ahead criminal?' becomes 'r' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'forge'+'r'='FORGER'
Can you help me to learn more?
(Other definitions for forger that I've seen before include "Ironworker" , "Blacksmith" , "Maker of false bank notes" , "Maker of false bank-notes" , "Person who makes phoney bank notes" .)