Princes, for example, demanding author’s share of profits (7)
I believe the answer is:
royalty
This could be a double definition.
'princes for example' is the first definition.
'profits' is the second definition.
(thesaurus)
'demanding author's share of' is the link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
(Other definitions for royalty that I've seen before include "King or queen's status" , "Regal status" , "Palace residents" , "Those of the monarchy" , "Payment for the right to use someone else's property" .)