Preserved dent in another form (6)
I believe the answer is:
tinned
'preserved' is the definition.
(tinning is a kind of preserving)
'dent in another form' is the wordplay.
'another form' indicates an anagram (I've seen this in other clues).
'dent'+'in'='dentin'
'dentin' is an anagram of 'TINNED'.
(Other definitions for tinned that I've seen before include "In cans" , "Sealed in a can" , "Canned" .)