Unjustified belief in education (9)
I believe the answer is:
intuition
'unjustified belief' is the definition.
(I've seen this before)
'in education' is the wordplay.
'education' becomes 'tuition' (tuition is a kind of education).
'in'+'tuition'='INTUITION'
(Other definitions for intuition that I've seen before include "Instinct" , "women are known for it" , "Suspicion" , "Gut feeling" , "Innate understanding" .)