Once having resolved to turn one in, go ahead (8)
I believe the answer is:
continue
'go ahead' is the definition.
'continue' can be an answer for 'go' (continuing is a kind of going). I'm not certain of the 'ahead' bit.
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for continue that I've seen before include "Resume" , "Proceed" , "Persist" , "Last" , "Carry on" .)