Restore to good working condition (6)

I believe the answer is:

repair

(Other definitions for repair that I've seen before include "do some darning" , "Restore, set right" , "Correct" , "Make good again" , "Restore to working condition" .)

I've seen this clue in The Irish Times.

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.