Crossword Genius

Marginal discounts? (7)

Ross

I believe the answer is:

rebates

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'discounts?' is the definition.
(rebating is a kind of discounting)

I cannot understand how the remainder of the clue works.

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(Other definitions for rebates that I've seen before include "Monies having to be sent back" , "Refunds of some of the amounts paid" , "enclosure?" , "Retrospective discounts" , "Refunds -- discounts" .)

I've seen this clue in the Evening Standard.
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