Author's payment (7)
I believe the answer is:
royalty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">author's payment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for royalty that I've seen before include "Ruler's family" , "percentage earned" , "Kings etc - paid to author" , "Prince, possibly" , "Palace residents" .)