Overthrowing of rule by monarch from another country (7)
I believe the answer is:
foreign
'from another country' is the definition.
(I've seen this in another clue)
'overthrowing of rule by' is the wordplay.
'overthrowing' says the letters should be written backwards.
'rule' becomes 'reign' (reigning is a kind of ruling).
'by' means one lot of letters go next to another.
'of' backwards is 'fo'.
'fo'+'reign'='FOREIGN'
'monarch' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for foreign that I've seen before include "Unfamiliar; from abroad" , "not appropriate" , "not typical" , "Concerning other nations" , "Not domestic" .)