Crossword Genius

Molten matter (5)

Ross

I believe the answer is:

magma

'molten matter' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for magma that I've seen before include "Molten rock in the earth's crust" , "hot stuff" , "That's hot!" , "crust's content" , "Hot fluid rock" .)

I've seen this clue in the Penny Press and The Guardian.
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