Unpaid debts (7)
I believe the answer is:
arrears
'unpaid debts' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for arrears that I've seen before include "Outstanding money" , "Ourtstanding payments" , "In these, one is behind with payments" , "Total unpaid debt" , "Back payments due on a debt" .)