Make shiny (7)

I believe the answer is:

burnish

(Other definitions for burnish that I've seen before include "Make shiny by friction" , "Make bright by rubbing" , "Polish by rubbing" , "Shine by rubbing" , "Buff up" .)

I've seen this clue in the Sydney Morning Herald.

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.