Crossword Genius

My mistake! (4)

Ross

I believe the answer is:

oops

'my mistake' is the definition.
(oops may be said to acknowledge a mistake)

This is the entire clue.

(Other definitions for oops that I've seen before include "My bad" , "Silly me, I've dropped something!" , "The sound of stupidity" , "Blunder explanation" , "Exclamation on making minor error" .)

I've seen this clue in The Guardian.
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