Crossword Genius

"What's done is done," e. g (9)

Ross

I believe the answer is:

platitude

(Other definitions for platitude that I've seen before include "Trite or insincere remark" , "Cliche" , "Trite saying" , "We've heard that before" , "Commonplace remark, banal or trite" .)

I've seen this clue in the LA Times.
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