Composer of America's official march (5)

I believe the answer is:

sousa

(Other definitions for sousa that I've seen before include "John Philip ---, US bandmaster" , "John Philip -, composer of famous marches (The Stars and Stripes for Ever)" , "American composer known for marches" , "Composer of "The Stars and Stripes Forever"" , "US composer of marches" .)

I've seen this clue in the Newsday.

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