Largest city by population in Africa's Maghreb region (10)

I believe the answer is:

casablanca

(Other definitions for casablanca that I've seen before include "Major city of Morocco" , "Moroccan city; film" , "City and port of Morocco" , "1942 film starring Bogart and Bergman" , "White House for Cubans" .)

I've seen this clue in The Times.

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