Pass on knowledge through group of schoolchildren (6)
I believe the answer is:
inform
'pass on knowledge' is the definition.
(I've seen this before)
'through group of schoolchildren' is the wordplay.
'through' becomes 'in'.
'group of schoolchildren' becomes 'form' (I can't explain this - if you can you should believe this answer much more).
'in'+'form'='INFORM'
Can you help me to learn more?
(Other definitions for inform that I've seen before include "Give knowledge to" , "Put wise" , "Brief" , "Provide facts - playing well" , "effective" .)