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Volcanic rock (4)

Ross

I think it could be either:

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4

6

'volcanic rock' 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 stream" , "Molten volcanic material" , "Stuff heatedly hurled out" , "Volcanic emanation" , "Volcanic flowing rock" .)

I've seen this clue in The Star Tribune, The Independent, the Newsday and The Telegraph.
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