International Baccalaureate excluding overthrown religious leader (5)
I believe the answer is:
rabbi
'religious leader' is the definition.
(Jewish religious leader)
'international baccalaureate excluding overthrown' is the wordplay.
'international baccalaureate' becomes 'ib' (this might be a standard abbreviation of which I'm unaware).
'excluding' becomes 'bar' (bar can mean excluding or except).
'overthrown' is a reversal indicator.
'ib'+'bar'='ibbar'
'ibbar' back-to-front is 'RABBI'.
Can you help me to learn more?
(Other definitions for rabbi that I've seen before include "Jewish learned man" , "Blue" , "Teacher of Jewish law" , "Spiritual leader of a Jewish congregation" , "Religious person" .)