Crossword Genius

Part of a calendar septet, and a phonetic hint to this puzzle's theme (7)

Ross

I believe the answer is:

tuesday

(Other definitions for tuesday that I've seen before include "Twenty-four hours" , "Wed after this" , "Is it suet day?" , "24-hour period" , "forty eight hours before Chesterton's man" .)

I've seen this clue in The New York Times.
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