What’s left for instance in puddled clay (6)
I believe the answer is:
legacy
'what's left' is the definition.
(what's left behind by a deceased person)
'for instance in puddled clay' is the wordplay.
'for instance' becomes 'eg' (synonyms).
'in' is an insertion indicator.
'puddled' indicates anagramming the letters (a mess or puddle of the letters).
'clay' with letters rearranged gives 'lacy'.
'eg' placed inside 'lacy' is 'LEGACY'.
(Other definitions for legacy that I've seen before include "Willed gift" , "Like old software" , "Something handed down" , "Something bequeathed in will" , "estate?" .)