Gush, as lava (4)
I believe the answer is:
spew
'gush as lava' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spew that I've seen before include "Belch forth" , "Money (slang)" , "Fetch up" , "Be sick" , "Casst out in a stream" .)