Resolve – to pay (a bill) (6)
I believe the answer is:
settle
I believe this is a double definition.
'resolve' is the first definition.
(I know that settle is a more specific form of resolve)
'to pay a bill' is the second definition.
(I've seen this in another clue)
(Other definitions for settle that I've seen before include "Resolve (an argument)" , "Find a home" , "Become calm and quiet" , "Light upon" , "Resolve (a dispute)" .)