Handle of identical large pot’s broken (7)
I believe the answer is:
surname
'handle' is the definition.
'identical large pot's broken' is the wordplay.
'identical' becomes 'same' ('same' can be similar in meaning to 'identical').
'large pot' becomes 'urn' (I've seen this before).
'broken' is an insertion indicator.
'same' placed around 'urn' is 'SURNAME'.
'of' acts as a link.
(Other definitions for surname that I've seen before include "Hereditary appellation" , "Such as 1 dn or 16 dn" , "Family cognomen" , "Family identifier" , "Hereditary identifier" .)