Entertainer dean sues mistakenly (8)
I believe the answer is:
danseuse
'entertainer' is the definition.
(danseuse is a kind of entertainer)
'dean sues mistakenly' is the wordplay.
'mistakenly' indicates an anagram.
'dean'+'sues'='deansues'
'deansues' is an anagram of 'DANSEUSE'.
(Other definitions for danseuse that I've seen before include "artiste" , "entertainer" , "Ballet girl" , "Ballerina" , "She takes steps" .)