Tear it badly - the dress! (6)
I believe the answer is:
attire
'the dress' is the definition.
(synonyms)
'tear it badly' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'tear'+'it'='tearit'
'tearit' with letters rearranged gives 'ATTIRE'.
(Other definitions for attire that I've seen before include "(To) dress; fine clothes" , "Formal clothing" , "Habit" , "Garments" , "Wear" .)