Related Clues:

• Go back, when editing
• Subvert a foreign party
• 'Go back one step' PC command
• Back up, on a PC
• Cancel (an order, action, effect etc)
• Reverse defeat
• Set aside legally
• Fully reverse
• "Go back," on a computer
• Declare invalid, as a marriage
• Invalidate, as a contract
• Ctrl + Z
• Word processing command Ctrl + Z
• Cancel removal of second article from regular publication
• Command after a computer goof