Dress: rate it poorly (6)
I believe the answer is:
attire
'dress' is the definition.
('attire' can be a synonym of 'dress')
'rate it poorly' is the wordplay.
'poorly' is an anagram indicator.
'rate'+'it'='rateit'
'rateit' anagrammed gives 'ATTIRE'.
(Other definitions for attire that I've seen before include "I treat badly the dress." , "Clothes worn" , "Clothing, apparel" , "'Dress, garb (6)'" , "12" .)