Reversal of rule from other lands (7)
I believe the answer is:
foreign
'from other lands' is the definition.
I can't tell whether this defines the answer.
'reversal of rule' is the wordplay.
'reversal' shows that the letters should be reversed in order.
'rule' becomes 'reign' (reigning is a kind of ruling).
'of' back-to-front is 'fo'.
'fo'+'reign'='FOREIGN'
Can you help me to learn more?
(Other definitions for foreign that I've seen before include "not appropriate" , "Overseas" , "Non-native" , "Of or from another country" , "Exotic" .)