Crossword Genius

Posh leaving desirable London area (6)

Ross

I believe the answer is:

poplar

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'london area' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for poplar that I've seen before include "Timber tree" , "Deciduous tree" , "The tree that quivers" , "Slender tree with quivering leaves" , "Tall, slender tree" .)

I've seen this clue in The Telegraph.
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