Indian in southern church makes shrill note (7)
I believe the answer is:
screech
'shrill note' is the definition.
'screech' can be an answer for 'shrill' (synonyms). I am not certain of the 'note' bit.
'indian in southern church' is the wordplay.
'indian' becomes 'Cree' (Cree is an example).
'in' is an insertion indicator.
'southern' becomes 'S' (abbreviation).
'church' becomes 'ch' (common abbreviation).
's'+'ch'='sch'
'cree' put into 'sch' is 'SCREECH'.
'makes' is the link.
Can you help me to learn more?
(Other definitions for screech that I've seen before include "Yell" , "Harsh, shrill cry" , "High pitched shout" , "Loud shrill cry" , "Squawk" .)