Firms up, like gelatin (4)

I believe the answer is:

sets

(Other definitions for sets that I've seen before include "Hardens" , "Classes" , "Scenery etc. of 11 across productions" , "Solidifies" , "Plants" .)

I've seen this clue in the USA Today.

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.