Vanish, having appraised mistake (9)
I believe the answer is:
disappear
'vanish' is the definition.
(synonyms)
'appraised mistake' is the wordplay.
'mistake' indicates an anagram.
'appraised' is an anagram of 'DISAPPEAR'.
'having' acts as a link.
(Other definitions for disappear that I've seen before include "Do a bunk" , "walk" , "Vanish from view" , "Leave" , "exit" .)