Crossword Genius

Clue for Yankee and his big day (6,2,4)

Ross

I believe the answer is:

fourth of july

'day' is the definition.
(Fourth of July is an example)

I don't understand the rest of the clue.

(Other definitions for fourth of july that I've seen before include "Day when three of first five US presidents died" , "US Independence Day" .)

I've seen this clue in The Guardian.
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