Resolve to pay (6)
I believe the answer is:
settle
This clue is a double definition.
'resolve' is the first definition.
(I know that resolve can be written as settle)
'pay' is the second definition.
(as in settling a bill)
'to' acts as a link.
(Other definitions for settle that I've seen before include "Get comfortable" , "Come to rest; bench" , "High-backed bench" , "Resolve - to pay one's debts" , "Decide - colonise" .)