Ms Toksvig and I in Californian city (3,5)

I believe the answer is:

san diego

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'californian city' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

(Other definitions for san diego that I've seen before include "Pacific port" , "Californian port" , "US city" , "California naval port" , "Calif. naval base" .)

I've seen this clue in The Telegraph.

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