Deduction, discount (6)
I believe the answer is:
rebate
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">deduction</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">discount</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(rebating is a kind of discounting)</span><br/ ><br/ ></span>
(Other definitions for rebate that I've seen before include "Beater (anag) -- partial refund" , "Refund of part of the amount paid" , "Refund - discount" , "Sum paid back" , "Money back, partial refund" .)