Old patriotic American song — one key loaded (anag) (6,6)

I believe the answer is:

yankee doodle

(Other definitions for yankee doodle that I've seen before include "Old US popular song" , "Traditional US song" , "Who came to town, riding on a pony" , "- - came to town (song)" , "American marching song" .)

I've seen this clue in The Guardian.

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