Underground lava (5)

I believe the answer is:

magma

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'underground lava' is the definition.
(I've seen this in another clue)
This is all the clue.

(Other definitions for magma that I've seen before include "Hot fluid rock" , "Glassy volcanic rock" , "Hot material" , "Molten rock in the earth's crust" , "Semi-fluid material within the earth's crust" .)

I've seen this clue in the Universal and the USA Today.

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