Tree from East London (6)

I believe the answer is:

poplar

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'tree' is the definition.
(poplar tree is a kind of tree)

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

(Other definitions for poplar that I've seen before include "Tall tree (which may tremble?)" , "Tall, slender tree" , "Tall tree of north temperate regions" , "part of London" , "Deciduous tree" .)

I've seen this clue in The Irish Independent.

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