Edward going round pub that's preserved (6)
I believe the answer is:
tinned
'preserved' is the definition.
(tinning is a kind of preserving)
'edward going round pub' is the wordplay.
'edward' becomes 'ted'.
'going round' is an insertion indicator (some letters go around others).
'pub' becomes 'inn' (an inn is a type of pub).
'ted' placed around 'inn' is 'TINNED'.
'that's' is the link.
(Other definitions for tinned that I've seen before include "Canned" , "In cans" , "Sealed in a can" .)