Crossword Genius

City once a small part of London? (7)

Ross

I believe the answer is:

babylon

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'city once' is the definition.
(I've seen this before)

'a small part of london?' is the wordplay.
'a small' becomes 'baby'.
'part of london?' becomes 'lon' (I can't justify this - if you can you should give a lot more credence to this answer).
'baby'+'lon'='BABYLON'

Can you help me to learn more?

(Other definitions for babylon that I've seen before include "Ancient capital" , "Place of sorrowful exile (or of luxury and decadence)" , "Sinful city in Biblical times, had Hanging Gardens" , "Wicked city of the Bible, on Euphrates river in central Iraq" , "Bony lab found in the ancient city" .)

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