Stockholder's bonus (8)
I believe the answer is:
dividend
'stockholder's bonus' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dividend that I've seen before include "Sum paid regularly to shareholders" , "Payment to shareholders" , "A share of profits paid to shareholders (8)" , "Portion of profits paid to a shareholder" , "Number to be divided, or share of profits" .)