Cracked porcelain? No, no, it's a copy (7)
I believe the answer is:
replica
'a copy' is the definition.
(replica is a kind of copy)
'cracked porcelain? no no' is the wordplay.
'cracked' indicates anagramming the letters.
'no' suggests deleting specific letters.
'porcelain' with 'no' taken out is 'prcelai'.
'prcelai' anagrammed gives 'REPLICA'.
'it's' is the link.
(Other definitions for replica that I've seen before include "Reproduction, fascsimile" , "Parcel I found with exact copy" , "Exact copy or model" , "Parcel I arranged as exact copy" , "Exact copy as of sport trophy" .)