Rosie leads in six out of ten performances of cancans in California (3,9)

I believe the answer is:

san francisco

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'in california' is the definition.
('San Francisco' is part of 'california')

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for san francisco that I've seen before include "City of the Golden Gate Bridge" , "US west coast port" , "Californian city" , "Californian port" , "US city renowned for its cable cars" .)

I've seen this clue in The Irish Times.

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