Molten rock (4)

I think it could be either:

Which length description are you looking for?:

lava

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

This is the entire clue.

(Other definitions for lava that I've seen before include "Emanation from volcano" , "Volcanic discharge" , "Volcanic emanation" , "Molten rock from volcanoes" , "Volcanic outflow" .)

I've seen this clue in the Newsday, The Guardian, The Times, The Mirror, the Evening Standard, The Sun and the Sydney Morning Herald.

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