Crossword Genius

Capital at the confluence of the Mekong and Tonlé Sap (5,4)

Ross

I believe the answer is:

phnom penh

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

I don't understand how the remainder of the clue works.

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(Other definitions for phnom penh that I've seen before include "Cambodian capital" , "Capital of Cambodia" .)

I've seen this clue in The Times.
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