Earthenware container, not as old, missing lid (4)
I believe the answer is:
ewer
'earthenware container' is the definition.
(ewer is a type of container)
'not as old missing lid' is the wordplay.
'not as old' becomes 'newer' ('new' can be the opposite of 'old' so perhaps 'newer' is reasonable for 'not as old').
'missing lid' means to remove the first letter.
'newer' with its initial letter taken away is 'EWER'.
(Other definitions for ewer that I've seen before include "Big jug" , "Large, wide-mouthed jug" , "Pitcher, water jug" , "Oversized jug" , "Container" .)