Manufacturer's payback (6)
I believe the answer is:
rebate
'manufacturer's payback' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rebate that I've seen before include "price reduction" , "Reduction in the cost" , "Money refunded" , "Cash refund" , "Beater (anag) -- partial refund" .)