Cunning political group removing extremists? (3)
I believe the answer is:
art
'cunning' is the definition.
(both can mean trickery)
'political group removing extremists?' is the wordplay.
'political group' becomes 'party' (a political party).
'removing extremists?' means to look at the middle letters (letters on the extremes are removed).
The middle of 'party' is 'ART'.
(Other definitions for art that I've seen before include "Works in a gallery" , "Eg, paintings, sculpture" , "are old-fashioned" , "Creative works; knack" , "eg Painting" .)