Breaking out innocent revolutionary with little noise (8)
I believe the answer is:
erupting
'breaking out' is the definition.
(to erupt is to emerge or break out)
'innocent revolutionary with little noise' is the wordplay.
'innocent' becomes 'pure' (I've seen this in another clue).
'revolutionary' says the letters should be written in reverse.
'with little noise' becomes 'ting' (I am not sure about this - if you are sure you should believe this answer much more).
'pure' backwards is 'erup'.
'erup'+'ting'='ERUPTING'
Can you help me to learn more?
(Other definitions for erupting that I've seen before include "Bursting out suddenly" , "Coming out" .)