Answer:

stet

Answer	Crossword Clue
STET	Dele's superceder
STET	"Let it stand," to an editor
STET	Editor's mark

STET	Galley mark
STET	Galley marking
STET	Margin marking
STET	Marginal notation
STET	"Leave it in," editorially
STET	"Leave this in"
STET	Cancel a dele
STET	Editor's notation

STET	Leave in, after all
STET	Let stand
STET	Manuscript mark
STET	Printer's direction
STET	Proofer's order
STET	Editor's marginal note
STET	Editorial notation
STET	Let it stand

STET	Opposite of "dele"
STET	Opposite of dele
STET	Printer's term
STET	Printing direction
STET	Proofer's mark
STET	Proofreader's word
STET	Undo a dele
STET	Editor's order

STET	Editor's sign of ignorance?
STET	Crosswordese word, with or without its first letter
STET	"Never mind!" notation
STET	"Leave it," to a proofreader
STET	Cancel an edit
STET	Mind-changer's mark
STET	Proofreader's mark
STET	Proofreading instruction

STET	"It was right the first time"
STET	Correction correction
STET	"Leave unchanged"
STET	Proofreader's row of dots
STET	Editor's "never mind"