Additional incentive payment (5)
I believe the answer is:
bonus
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">additional incentive payment</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bonus that I've seen before include "Extra dividend" , "Perk" , "Added extra" , "Welcome and unexpected extra" , "Additional payment or benefit above the norm" .)