City on the French Riviera founded by Phocaeans in about the 3rd century BC (4)

I believe the answer is:

nice

(Other definitions for nice that I've seen before include "Portuguese river, a centre for port" , "Attractive Mediterranean resort" , "Leading resort on the French Riviera" , "French resort; agreeable" , "Delightful - French resort" .)

I've seen this clue in The Independent.

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