Earthenware daughter left out (5)
'earthenware' is the definition.
(delft is a kind of earthenware)
'daughter left out' is the wordplay.
'daughter' becomes 'd'.
'out' indicates an anagram (out can mean wrong or inaccurate).
'left' is an anagram of 'elft'.
(Other definitions for delft that I've seen before include "crockery pieces", "City in the Netherlands", "Dutch town - tin-glazed earthenware", "Dutch blue/white glazed earthenware", "Dutch town famous for ceramics".)