Make malleable using heat (6)

I believe the answer is:

anneal

(Other definitions for anneal that I've seen before include "Heat and cool slowly to toughen, metal or glass" , "Make tough" , "Temper, harden" , "Heat and cool (metal/glass) to remove stresses" , "Heat-treat (metal or glass)" .)

I've seen this clue in The New York 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.