Like one across colony, doctor is wearing spectatcles (7)

I believe the answer is:

colombo

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But I can't explain it at all! Could you help me understand?

(Other definitions for colombo that I've seen before include "Sri Lankan capital" , "City of Sri Lanka" , "Asian city" , "Capital of Sri Lanka" , "Sri Lankan city" .)

I've seen this clue in The Hindu.

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