Attire caught hostel out (7)
I believe the answer is:
clothes
'attire' is the definition.
(I know that attire can be written as clothes)
'caught hostel out' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'hostel' anagrammed gives 'lothes'.
'c'+'lothes'='CLOTHES'
(Other definitions for clothes that I've seen before include "Worn items" , "Garb" , "Gear" , "dresses" , "Items of apparel" .)