Primate managed to intercede in self-inflicted blunder (5)
I believe the answer is:
orang
'primate' is the definition.
(orang is a kind of primate)
'managed to intercede in self-inflicted blunder' is the wordplay.
'managed' becomes 'ran' (both can mean organised or was in charge of).
'to intercede in' is an insertion indicator.
'self-inflicted blunder' becomes 'og' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'ran' placed within 'og' is 'ORANG'.
Can you help me to learn more?
(Other definitions for orang that I've seen before include "Short tree-dweller" , "- - -utan" , "Large ape" , "Wild animal briefly appeared" , "Forest-dweller with red hair" .)