Old weapon academic found in ancient kingdom (7)
I believe the answer is:
macedon
'ancient kingdom' is the definition.
'macedon' can be an answer for 'kingdom' (I've seen this before). I'm unsure of the 'ancient' bit.
'old weapon academic' is the wordplay.
'old weapon' becomes 'mace' (I've seen this in another clue).
'academic' becomes 'don' (type of academic - especially at Oxbridge).
'mace'+'don'='MACEDON'
'found in' acts as a link.
Can you help me to learn more?
(Other definitions for macedon that I've seen before include "Kingdom of Alexander the Great" , "Philip's rule" , "Alexander the Great's country" , "Philip's place" .)