Payment to Prince, say, a member of the monarchy (7)
I believe the answer is:
royalty
I believe this clue is a double definition.
'payment to prince say' is the first definition.
'a member of the monarchy' is the second definition.
(Other definitions for royalty that I've seen before include "Sovereigns" , "percentage earned" , "Regal status" , "(Rank of) kings and queens" , "Queen?" .)