Render ineffective uproar about way of speaking English (7)
I believe the answer is:
torpedo
'render ineffective' is the definition.
I can't judge whether this defines the answer.
'uproar about way of speaking english' is the wordplay.
'uproar' becomes 'todo' (to-do can mean a fuss or furore).
'about' is an insertion indicator.
'way of speaking' becomes 'RP' (Received Pronunciation, standard British accent).
'english' becomes 'E' (abbreviation as in OED).
'rp'+'e'='rpe'
'todo' placed around 'rpe' is 'TORPEDO'.
Can you help me to learn more?
(Other definitions for torpedo that I've seen before include "Self-propelled underwater explosive device" , "Submarine weaponry" , "attack" , "Explosive missile from submarine" , "Missile fired from underwater submarine" .)