Crossword Genius

Hot rock (4)

Ross

I believe the answer is:

lava

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">hot rock</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Newsday, the Penny Press and The Telegraph.
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