Study old money in European kingdom (7)
I believe the answer is:
denmark
'european kingdom' is the definition.
'denmark' can be an answer for 'kingdom' (I've seen this before). I am unsure of the 'european' bit.
'study old money' is the wordplay.
'study' becomes 'den' (den can mean an office or study).
'old money' becomes 'mark' (I've seen this before).
'den'+'mark'='DENMARK'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for denmark that I've seen before include "Scandinavian country" , "Hamlet's homeland" , "Monarchy, a member of the European Union" , "North European country" , "Aarhus is its second-largest city" .)