Editor's overruling (4)
I believe the answer is:
stet
'editor's overruling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stet that I've seen before include "Notation meaning as is, thus" , "Let it remain (printing)" , "Printing term" , "Eg, molar" , "Let it stand (in proofing)" .)