Cancel (an order, action, effect etc) (4)

I believe the answer is:

undo

(Other definitions for undo that I've seen before include "Ruin or loosen ties" , "Ruin prospects of; cancel" , "Release fastening" , "Overturn" , "Loosen or reverse" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.