Succeed in performing evil rap (7)
I believe the answer is:
prevail
'succeed' is the definition.
(prevail can mean to succeed or triumph)
'performing evil rap' is the wordplay.
'performing' indicates an anagram (the letters move around or 'perform').
'evil'+'rap'='evilrap'
'evilrap' is an anagram of 'PREVAIL'.
'in' acts as a link.
(Other definitions for prevail that I've seen before include "Triumph, overcome" , "come out on top" , "get the upper hand" , "Succeed ultimately" , "Be widespread; prove superior" .)