Clothes appear out on line (7)
I believe the answer is:
apparel
'clothes' is the definition.
('apparel' can be a synonym of 'clothes')
'appear out on line' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'on' is a charade indicator (letters next to each other).
'line' becomes 'l'.
'appear' with letters rearranged gives 'appare'.
'appare'+'l'='APPAREL'
(Other definitions for apparel that I've seen before include "Clothes - garments" , "formal dress?" , "whatever people have on" , "Formal word for clothing" , "Garb, clothes" .)