Hot, molten rock (4)

I think it could be either:

Which length description are you looking for?:

lava

'hot molten rock' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for lava that I've seen before include "Hot molten rock" , "Flowing extrusive magma" , "Unstoppable red tide" , "Obsidian" , "Molten rock expelled by a volcano" .)

I've seen this clue in the Irish Times (Simplex), The Irish Times, The Guardian, The Star Tribune and The Telegraph.

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