Split up, avoiding east London landmark (5)

I believe the answer is:

shard

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

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 "Bit of pottery" , "chip" , "Piece of broken ceramic - London skyscraper" , "remnant after break-up" , "Broken piece (of pottery, glass etc)" .)

I've seen this clue in The Independent.

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