Unknowing (8)
I believe the answer is:
ignorant
'unknowing' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ignorant that I've seen before include "Crass" , "Illiterate - unaware" , "Unlearned, lacking knowledge" , "Lacking knowledge or awareness" , "Lacking knowledge or lacking manners" .)