Cheaply sell what's left (9)

I believe the answer is:

remainder

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This clue could be a double definition.

'cheaply sell' is the first definition.
'remainder' can be an answer for 'sell' (remaindering is a kind of selling). I'm not sure about the 'cheaply' bit.

'what's left' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for remainder that I've seen before include "Balance" , "Scrap" , "Left-over" , "It's left over after division" , "that's left" .)

I've seen this clue in The Daily Express.

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