Ship that is carrying good clothing (8)
I believe the answer is:
lingerie
'clothing' is the definition.
(lingerie is a kind of clothing)
'ship that is carrying good' is the wordplay.
'ship' becomes 'liner' (liner is a kind of ship).
'that is' becomes 'ie' ('i.e.' can be a synonym of 'that is').
'carrying' is an insertion indicator.
'good' becomes 'g' (abbreviation).
'liner'+'ie'='linerie'
'linerie' enclosing 'g' is 'LINGERIE'.
(Other definitions for lingerie that I've seen before include "Ladies' underwear" , "Garments" , "Scanties" , "Women's underwear and nightwear" , "Fancy underwear for women" .)