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Molten rock (4)

Ross

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magma

'molten rock' is the definition.
(molten rock from a volcano)

This is the entire clue.

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

I've seen this clue in the Penny Press, the USA Today, the King Feature Syndicate, The Guardian, the Universal, the LA Times, The Mirror, The Times, the Evening Standard and the Newsday.
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