Protest with roughly fifty in total (8)
I believe the answer is:
demolish
'total' is the definition.
(I've seen this in another clue)
'protest with roughly fifty in' is the wordplay.
'protest' becomes 'demo' (demonstration).
'with' means one lot of letters go next to another.
'roughly' becomes 'ish' (I can't explain this - if you can you should believe this answer much more).
'fifty' becomes 'l' (Roman numeral).
'in' indicates putting letters inside.
'demo'+'ish'='demoish'
'demoish' enclosing 'l' is 'DEMOLISH'.
Can you help me to learn more?
(Other definitions for demolish that I've seen before include "Knock down, a building or argument perhaps" , "Eat up" , "Break down" , "Knock or tear down" , "Raze to the ground" .)