Please pay in full (7)
I believe the answer is:
satisfy
This clue is a double definition.
'please' is the first definition.
(to satisfy someone is to please them)
'pay in full' is the second definition.
(satisfy can mean to pay off a debt)
(Other definitions for satisfy that I've seen before include "Fulfil requirements" , "Fully meet (conditions)" , "Meet (a requirement)" , "Comply with (condition)" , "Meet expectations" .)