Professional performer rates it badly (7)
I believe the answer is:
artiste
'professional performer' is the definition.
(I've seen this before)
'rates it badly' is the wordplay.
'badly' indicates anagramming the letters.
'rates'+'it'='ratesit'
'ratesit' anagrammed gives 'ARTISTE'.
(Other definitions for artiste that I've seen before include "Attires like entertainer" , "Entertainer, singer or dancer" , "Person playing" , "Attires for professional entertainer" , "A sitter for creative person" .)