Lava, beneath the surface (5)

I believe the answer is:

magma

(Other definitions for magma that I've seen before include "Semi-fluid material within the earth's crust" , "Hot material" , "Hot fluid rock" , "Lava" , "Molten or pasty rock" .)

I've seen this clue in the King Feature Syndicate.

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.