Scrap pile somewhere in London (5)

I believe the answer is:

shard

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'scrap' is the definition.
(I have seen 'Scrap of pottery ' mean 'shard' so perhaps 'scrap' could also mean 'shard')

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for shard that I've seen before include "archaeological find" , "Shell

I've seen this clue in The Guardian.

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