Money-back offer (6)
I believe the answer is:
rebate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">money-back offer</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rebate that I've seen before include "Beater (anag) -- partial refund" , "Refund - discount" , "Reduction in the cost" , "price reduction" , "Return of, eg, tax" .)