Crossword puzzle clue "an editor's may be blue"

A crossword editor has to be very careful when changing one--unlike this puzzle's editor, who was careless four times herein

An editor's may be blue

"Blue I," "Blue II" and "Blue III" artworks

Editor of "The Blue Fairy Book"

How some letters to the editor may be written

An editor may wield one

Blue Cross Blue Shield rival

What makes blue jeans blue