Pay to come down (6)
I believe the answer is:
settle
I believe this is a double definition.
'pay' is the first definition.
(as in settling a bill)
'come down' is the second definition.
(settling is a kind of coming down)
'to' acts as a link.
(Other definitions for settle that I've seen before include "Resolve - to pay one's debts" , "Resolve (a dispute)" , "Come to rest or decide an argument" , "Colonise with a seat" , "Put down roots or pay debt" .)