Crossword Genius

Surface magma (4)

Ross

I believe the answer is:

lava

'surface magma' 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 "Molten rock expelled by a volcano" , "What volcano ejects" , "Obsidian" , "Hot molten rock" , "Volcanic emanation" .)

I've seen this clue in The Sunday Times.
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