Crossword Genius

Key mistake? (4)

Ross

I believe the answer is:

typo

'key mistake?' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for typo that I've seen before include "What's not right" , "Literal - printing mistake" , "Thanks; good health!" , "Misprint" , "Literal error in printed matter, in short" .)

I've seen this clue in the LA Times.
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