Crossword Genius

Hot rock (4)

Ross

I believe the answer is:

lava

'hot rock' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for lava that I've seen before include "Obsidian" , "Volcanic spillage" , "Flowing extrusive magma" , "Emanation from volcano" , "Volcanic emission" .)

I've seen this clue in the Penny Press, the Newsday and The Telegraph.
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