South Carolina port city (10)

I believe the answer is:

charleston

(Other definitions for charleston that I've seen before include "Lively dance - then carols (anag)" , "US city - 1920s' dance" , "Town of South Carolina which gave its name to a 1920s dance craze" , "Dance making" , "American port" .)

I've seen this clue in the Newsday.

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