Statement of money owed (4)
I believe the answer is:
bill
'statement of money owed' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bill that I've seen before include "parliamentary proposal" , "Circular - account" , "Banknote; beak" , "Piece of legislation -- one of the Clintons" , "Account - legislation" .)