Hot molten rock (5)

I think it could be either:

Which length description are you looking for?:

magma

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

This is the entire clue.

(Other definitions for magma that I've seen before include "hot filling in crust" , "Hot material" , "Hot fluid rock" , "Molten or pasty rock" , "Lava" .)

I've seen this clue in the Evening Standard, the Irish Times (Simplex), The Independent, The Telegraph and The Guardian.

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