Volcanic emission (4)

I believe the answer is:

lava

'volcanic emission' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for lava that I've seen before include "Volcanic emission" , "Volcano output" , "Molten rock from volcanoes" , "Volcanic flowing rock" , "Emanating magma" .)

I've seen this clue in The Irish Times, The Star Tribune and the Sydney Morning Herald.

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