Extra virgin (6)
I believe the answer is:
unused
I believe this clue is a double definition.
'extra' is the first definition.
(I've seen this before)
'virgin' is the second definition.
(thesaurus)
(Other definitions for unused that I've seen before include "Not utilised" , "Unaccustomed" , "'Fresh, new (6)'" , "Left over" , "Pristine" .)