Clairvoyance (6,5)
I believe the answer is:
second sight
'clairvoyance' is the definition.
(I know that second-sight is a type of clairvoyance)
This is the entire clue.
(Other definitions for second sight that I've seen before include "Something uncanny" , "not visited at very start of tour?" , "Prophetic vision" , "aware of future potential?" , "extraordinary ability" .)