Raise alternating heel going over lava amid violent disturbance (8)
I believe the answer is:
upheaval
'violent disturbance' is the definition.
(I've seen this in another clue)
'raise alternating heel going over lava' is the wordplay.
'raise' becomes 'up' (I've seen this in other clues).
'alternating heel' becomes 'he' (I am not sure about this - if you are sure you should believe this answer much more).
'going over' shows that the letters should be reversed in order.
'lava' reversed gives 'aval'.
'up'+'he'+'aval'='UPHEAVAL'
'amid' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for upheaval that I've seen before include "Violent or sudden change or disruption" , "Great disturbance and disorder" , "Disruptive disturbance" , "Violent or sudden disturbance" , "A pH value? (anag)" .)