Lost city to feature a brat (6)

I believe the answer is:

urchin

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'a brat' is the definition.
(thesaurus)

'lost city to feature' is the wordplay.
'lost city' becomes 'ur' (ancient Sumerian city state. I am not sure about the 'lost' bit.).
'to feature' becomes 'chin' (facial feature).
'ur'+'chin'='URCHIN'

Can you help me to learn more?

(Other definitions for urchin that I've seen before include "Ragged child; marine animal" , "Ragged boy" , "poor mite" , "Young troublemaker" , "Poor city child" .)

I've seen this clue in The Mirror.

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