"Leave it as is," to an editor (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
stet
(Other definitions for stet that I've seen before include "Eg, molar" , "Let it remain (printing)" , "Notation meaning leave as is, don't alter spelling" , "Instruction to leave spelling as is" , "Word to cancel change" .)