Wielding a blue pencil is an idiom that refers to the act of editing or censoring something. It is derived from the practice of editors using a blue pencil to make corrections on a manuscript. The phrase is often used to describe someone who has the authority to make changes or to censor something. In this context, the crossword solutions for the term 'wield a blue pencil' are EDIT, which is a four-letter word meaning to make changes or corrections to a text.