Shout to enrol indigenous people in school (7)
I believe the answer is:
screech
'shout' is the definition.
(I know that screech is a type of shout)
'people in school' is the wordplay.
'people' becomes 'cree' (I can't justify this - if you can you should believe this answer much more).
'in' is an insertion indicator.
'school' becomes 'sch' (common abbreviation).
'cree' inserted into 'sch' is 'SCREECH'.
'to enrol indigenous' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for screech that I've seen before include "Sharp piercing cry" , "Cry raucously; type of owl" , "Loud harsh cry" , "Loud shrill cry" , "High pitched shout" .)