First Frankenstein rebuilds corpse with surgical instrument (7)
I believe the answer is:
forceps
'surgical instrument' is the definition.
(I've seen this before)
'first frankenstein rebuilds corpse' is the wordplay.
'first frankenstein' becomes 'f' (1st letter of 'frankenstein').
'rebuilds' indicates anagramming the letters (I've seen 'rebuilding' mean this).
'corpse' is an anagram of 'orceps'.
'f'+'orceps'='FORCEPS'
'with' acts as a link.
(Other definitions for forceps that I've seen before include "Pincer-like instruments" , "Used by surgeon" , "Surgical implement" , "Pincers aiding delivery of babies" , "They help to pull out infant" .)