Milk container (6)
I believe the answer is:
carton
'milk container' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for carton that I've seen before include "A cardboard container as for milk" , "Flapped cardboard box" , "Light cardboard box" , "Cantor (anag)" , "Cardboard or plastic container" .)