Agreed to keep revered Hindu in religious schools (8)
I believe the answer is:
yeshivas
'religious schools' is the definition.
(I've seen this in another clue)
'agreed to keep revered hindu' is the wordplay.
'agreed' becomes 'yes' ('agreed' can mean 'yes').
'to keep' means one lot of letters goes inside another.
'revered hindu' becomes 'shiva' (I can't justify this - if you can you should give a lot more credence to this answer).
'yes' enclosing 'shiva' is 'YESHIVAS'.
'in' is the link.
Can you help me to learn more?
(Other definitions for yeshivas that I've seen before include "seminaries" , "Schools for the study of Jewish religious texts" .)