Entertainer's treat is misguided (7)
I believe the answer is:
artiste
'entertainer's' is the definition.
(artiste is a kind of entertainer)
'treat is misguided' is the wordplay.
'misguided' indicates an anagram (letters guided into the wrong places).
'treat'+'is'='treatis'
'treatis' anagrammed gives 'ARTISTE'.
(Other definitions for artiste that I've seen before include "Trouper" , "A sitter for creative person" , "professional dancer?" , "Tears it (anag.)" , "Player" .)