Lack of knowledge in school subject undermining Geordie? (9)
I believe the answer is:
nescience
'lack of knowledge' is the definition.
(I've seen this before)
'subject undermining geordie?' is the wordplay.
'subject' becomes 'science' (science is a kind of subject).
'undermining' is a charade indicator (letters next to each other).
'geordie?' becomes 'NE' (Geordies are from Tyneside in the North East).
'science' after 'ne' is 'NESCIENCE'.
'in school' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nescience that I've seen before include "Lack of knowledge" , "Literary word for ignorance" , "Lack of awareness" .)