My oracle, unfortunately mine (8)
I believe the answer is:
claymore
'mine' is the definition.
(I've seen this before)
'my oracle unfortunately' is the wordplay.
'unfortunately' is an anagram indicator (a bad or unfortunate spelling).
'my'+'oracle'='myoracle'
'myoracle' is an anagram of 'CLAYMORE'.
(Other definitions for claymore that I've seen before include "Scottish highlander's sword" , "pipe" , "Two-edged broadsword" , "Highland weapon" , "Scottish two-edged sword" .)