Monies left in a bank (8)
I believe the answer is:
deposits
'monies left in a bank' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for deposits that I've seen before include "Despots I find making bank lodgements" , "Lodges in bank" , "Monies in a bank or minerals in the ground" , "Matter laid down or money in the bank" , "Lays down-inbank account?" .)