What oil may do in frigid temperatures (7)

I believe the answer is:

congeal

(Other definitions for congeal that I've seen before include "Become solid" , "Curdle" , "Coagulate" , "cake" , "Cool and solidify" .)

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.