Crossword Genius

Capital Radio occasionally plugs "Rockin' Robin" (7)

Ross

I believe the answer is:

nairobi

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'capital' is the definition.
(capital of Kenya)

I cannot understand how the rest of the clue works.

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(Other definitions for nairobi that I've seen before include "Badly-behaved child" , "African city" , "East African capital" , "Flat round object" , "I, a robin (anag) - city" .)

I've seen this clue in The Independent.
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