Something performed by troublemaker for powerful effect (6)
I believe the answer is:
impact
'powerful effect' is the definition.
(an impact is a powerful effect)
'something performed by troublemaker' is the wordplay.
'something performed' becomes 'act' (an act on stage).
'by' is a charade indicator (letters next to each other).
'troublemaker' becomes 'imp' (I've seen this in another clue).
'act' after 'imp' is 'IMPACT'.
'for' acts as a link.
(Other definitions for impact that I've seen before include "Marked effect or influence" , "Crash" , "Strong effect" , "Force exerted by collision" , "The striking of one thing against another" .)