Clothes I treat wrongly (6)
I believe the answer is:
attire
'clothes' is the definition.
(attire is clothing)
'i treat wrongly' is the wordplay.
'wrongly' is an anagram indicator.
'i'+'treat'='itreat'
'itreat' anagrammed gives 'ATTIRE'.
(Other definitions for attire that I've seen before include "Formal clothing" , "Special clothing" , "Prepare" , "Clothing - tear it (anag)" , "(To) dress; fine clothes" .)