Go ahead with borrowed money (7)
I believe the answer is:
advance
I believe this is a double definition.
'go ahead' is the first definition.
(I've seen this in another clue)
'borrowed money' is the second definition.
(I've seen this before)
'with' acts as a link.
(Other definitions for advance that I've seen before include "capital" , "Forward - loan - make progress" , "Publisher's payment" , "Move forward to get loan?" , "Forward movement, a change for the better" .)