See to an advance of money (4)
I believe the answer is:
loan
'advance of money' is the definition.
(I've seen this in another clue)
'see to an' is the wordplay.
'see' becomes 'lo' ('lo' is an archaic exclamation meaning 'look!').
'lo'+'an'='LOAN'
(Other definitions for loan that I've seen before include "Something lent" , "Money borrowed at interest" , "One acquired temporarily" , "Advance, borrowing" , "Overdraft" .)