Money available to borrow (6)
I believe the answer is:
credit
'money available to borrow' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for credit that I've seen before include "Due recognition for kind of loan?" , "Positive bank balance" , "result of points on course" , "support for one with money problems" , "Believe - one side of an account" .)