Volcanic emission (4)

I believe the answer is:

lava

'volcanic emission' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for lava that I've seen before include "Volcanic emission" , "Volcano output" , "Molten rock from volcanoes" , "Volcanic flowing rock" , "Emanating magma" .)

I've seen this clue in The Star Tribune, The Irish Times and 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.