Renders ineffective revolutionary seen holding gun (7)
I believe the answer is:
'renders ineffective' is the definition.
I can't tell whether this definition defines the answer.
'revolutionary seen holding gun' is the wordplay.
'revolutionary' is a reversal indicator.
'holding' indicates putting letters inside.
'gun' becomes 'gat' (gat is a kind of gun).
'seen' written backwards gives 'nees'.
'nees' going around 'gat' is 'NEGATES'.
Can you help me to learn more?
(Other definitions for negates that I've seen before include "Nullifies" , "Denies the truth of" , "Repudiates" , "Counteracts" , "Cancels" .)