But it's not discarded by the dealer (5)

I believe the answer is:

scrap

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'dealer' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for scrap that I've seen before include "Small piece - fight" , "Fragment or remnant" , "Abolish; leftover" , "Cancel; fight" , "bundle" .)

I've seen this clue in the Evening Standard.

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